I always thought that all Fed Starships had two classifications: Peacetime and Wartime ones (like how the original NCC 1701 was an exploration ship when exploring, but a Heavy Cruiser in battle situations). The GCS and Sovereign ships are Explorers ships in peacetime, meaning they can go extneded periods without Starbase support. But in combat situations they are both Battleships.
And yes, GCS can hold it up in fights. Look at the damage they take in the Dominion War episodes and they keep going (stuff that would've caused a breach in earlier GCS', so they must have fixed whatever flaws they have).
As for B5, I like it (aside from the horrible acting in certain cases and awful dialogue) but once someone called it "LOTR in space" I started liking it less as it stuck in my mind.
And yes, GCS can hold it up in fights. Look at the damage they take in the Dominion War episodes and they keep going (stuff that would've caused a breach in earlier GCS', so they must have fixed whatever flaws they have).
As for B5, I like it (aside from the horrible acting in certain cases and awful dialogue) but once someone called it "LOTR in space" I started liking it less as it stuck in my mind.