If this is your first TT, many things that matter can't be seen and with some things that can be seen, you can't tell what's good and what is bad. Don't fall for the bling in some TTs. For above average build quality and reliability, you can't go wrong with an OutdoorsRV product.
We thought our first TT was our forever TT. It lasted just one season before we realized it wasn't even close to suiting our needs. Better informed, after spending a ton of time researching brands and models and finding a replacement, it turned out to be a lemon that got returned under warranty. You might want to rent or borrow a TT and see what works and what doesn't. Some things that can matter won't be discovered until you actually own a TT. Going to an RV show can be really frustrating as they all look the same after a while. Another thing you could do is rent a cabin in a CG and walk around and talk to some owners - you would be amazed at things you can learn. Talk to an independent RV shop for suggestions. Also, there are good dealers and bad dealers.
Choose wisely, choose once...