I wonder?

[Itisnotlogical]

The one consistent thing is that, once he got past the first couple and had a choice, the current Doctor's least favourite incarnation tends to be the previous one.

I can imagine 10 not being a very big fan of 9. While 9 still had a sense of humor, he was definitely much more grounded and serious about his tasks than 10. 10 would have probably found 9 boring

(David Tennant, Tenth Doctor, why has nobody made that pun yet?)

 

[Sindatur]

The one consistent thing is that, once he got past the first couple and had a choice, the current Doctor's least favourite incarnation tends to be the previous one.

I can imagine 10 not being a very big fan of 9. While 9 still had a sense of humor, he was definitely much more grounded and serious about his tasks than 10. 10 would have probably found 9 boring

(David Tennant, Tenth Doctor, why has nobody made that pun yet?)

I've called him 10nant on occasion, and Billie Piper, of course, has a different 10 Nickname for him

 

[Green Lantern]

Actualy, I think 2 had a harder time comming to terms with his "death" than 4, infact I didn't even notice his fear of regenerating.