I think it is interesting that most people's assumptions about Decker's choice is based on the belief that they (Decker and his crew) knew that once the Constellation was disabled the Planet Killer would ignore the ship (basically, not finish the job of destroying it).
If the wrong choice was abandoning ship, then were the crew of the Enterprise ever in any real danger? The Constellation survived it's encounter with the Planet Killer (though disabled), shouldn't the same be true of the Enterprise under the same scenario? As long as the Enterprise crew wasn't on a planet, were they really in any danger (as a whole)?
The Planet Killer attacked the Enterprise without warning, but ignored the Constellation once it was no longer a threat... maybe the best course of action (for the crew of the Enterprise) was to get the Enterprise damaged enough to no longer be a threat.
But if you believe that the Enterprise crew was in real danger from the Planet Killer, then the same would have been true for the crew of the Constellation while it was still being attacked (and the attack continued while the crew was abandoning ship).
But the
Enterprise apparently came under attack only because it generated sufficient power levels at sufficient range of the Planet Killer to be perceived as a threat, or at least that was Spock's speculation. I think, with regard to the
Constellation it all boils down to how heavily she was damaged, and how quickly, as well as the amount of informaton that Decker's science officer Masaba was able to derive. It could be he or she wasn't quite so clever as our Mister Spock.
If there had been a planet within transporter range (and the transporters were functioning), would it have been better for the crew of the Enterprise to stay on board while the Enterprise was being pulled inside the Planet Killer? Or should they have taken their chances on the planet?
But you seem to assume that it was possible for the
Enterprise crew to beam off of the ship to the planet between the time that the ship starts being drawn into the Planet Killer, and that there was minimal likelihood that the ship would be able to break away (which is indeed possible given the fact that Kirk's fire from the
Constellation appeared to be what distracted it.) I recall the entire
Enterprise crew save Kirk beaming down to the planet in 'This Side of Paradise' but I don't recall a specific timeframe given. I'd be inclined to think it would take at least an hour, depending on how many transporters you suppose the ship to have.
I digress. My point is that it is my conclusion that Decker must have been planning a self-destruct plan against the Planet Killer, similar to the one that finally defeated it, for his beaming his crew down to the planet to make sense. If he was going down fighting, wouldn't it decrease his fighting effectiveness to order them to beam down to a planet that would likely be 'eaten' anyway, thus killing them all anyway?
I have to admit that the fact that Decker doesn't mention any 'plan' other than attacking the Planet Killer with both ships until he does his shuttle suicide and Kirk and Spock notice the apparent damage, rather undermines my benefit of the doubt for Decker having a plan at all. This could be the mistake in judgment that led to his apparent nervous breakdown.
It could, of course, have been just that: a mistake. A rather serious one, but a mistake nonetheless. We humans are rather prone to them.
Such a mistake could have been atypical of Decker's 'normal' command style and attributable to the pressure of the situation, and he therefore might otherwise be an effective commander. Hell, he might have even been a reasonably 'effective' commander regardless, even if he was a bit less clever than Kirk. Perhaps he managed to avoid the rather 'unusual' circumstances one James T. Kirk tended to find himself in?
Recall that the Planet Killer was leaving L-374 without having destroyed the inner two planets of that system... so there was the possibility that it might not have destroyed the third planet too when the Constellation was under attack. The Constellation seem likely to be destroyed, and maybe the Planet Killer wouldn't have gone after the third planet (the same way it didn't go after the first and second planets of that system).
But anyone saying that the Constellation was the safest place for the crew of the Constellation must also believe that as long as the crew of the Enterprise didn't leave the Enterprise that they were also safe.
I don't know - for me personally I would feel safer aboard a starship if the thing attacking me's M.O. appears to be destroying planets, even if the Planet Killer hadn't munched down those other two planets yet. (I would also rather die in the line of duty at my station than await death on a doomed planet.) Again, this all depends on exactly what Decker an his crew
knew at the time vis a vis what Kirk and crew knew as depicted in the episode.
I don't think that either crew was entirely
safe aboard their ships, just more safe than they would be on an ignored or disabled ship than a planet likely to be a filet mignon.
Frankly, I don't believe that the crew (of either ship) where the most important factor for Decker... the people who were in the Rigel system were his primary concern.
I would tend to agree. I just don't think his plan was well thought out and that it was only through the coincidental intervention of the
Enterprise that his original plan (if it was his) was successful at all. That's why I don't give him the highest rating.