I have a 2012 Coleman CT250GS. This is my first TT. I know people who have a 2012 StarCraft so I can compare quite fairly. I didn't have a lot of warranty issues, but looking online at the models you give, I'd take the Coleman. Fit and finish between the two are very similar, but the Coleman has the escape door for the bunks and seems to be better appointed. If you have a specific question, I'd be happy to answer.
A lot of posters lately have reported lots of problems with the Winnebago TTs. Search the forum for those posts.