We have a skinny kid. Pampers Easy Ups seemed smaller than the Huggies Pullups, IIRC. Can't speak to 7th generation.
We did not have much luck with pullups. DS just peed in them like they were diapers. You can get a fair bit of toilet training done in diapers but when you really feel you are ready, I think it makes sense to take the plunge and go for (gasp) underpants. Yes you will get puddles on your floor. If you get a whole lot of puddles, go back to diapers for a while and try again later. That's just my 2cents. Other families I know have had great luck with disposables... just tell the kid "don't get the stars/backpacks/racecars wet" and they work to keep them dry. That did not happen with my DS but maybe DD will be different.
Because we didn't really use pullups for training, it made it easy to use them later for overnight (I have no illusions that DS will be dry at night anytime soon but again this is not an issue for most kids). We were able to make a clean break from diapers (when he was ready to be dry during the day) and present him with his special "overnight underpants" (that also got used for long car trips, etc).
My sweet boy 8/06
My beautiful girl 10/09