That depends on what you want from the TT what your budget is, how quick set up you want need and also style you prefer. We chose ours on the basis of the quick set up of the base unit and compromised on size a little (although it is far from poky!). Then you have folding campers to throw into the mix, although we ruled them out as we didn't want to tow anything that big. If you do a search you will find hundred of posts with almost as many opinions!
Forgot to reply to your original question we can store lots in the trailer although I think Griff should start a packing consultancy! We only have food, clothes and toys
We've got a Raclet Quickstop - we wanted something as simplistic as possible to erect. The sleeping compartment is up and erect in minutes and we've managed the awning in about 20 - 25 mins - which is not bad going. We looked at the Raclet Foreal & the Cabonon Mistral but the set up times is what put us off.
Pretty much everything is in the trailer, all that goes in the car is the fridge, our clothes & pillows.
Looking forward to getting away in it on Saturday! Cofton here we come!
The pram hood style of trailer tent, like the Olympe that Griff has, have a bit more storage because the awning in integral, so you don't have to pack awning and poles. We get loads in ours, and we don't have to unpack it to use the beds.
We're changing though, we find it very heavy so we are sacrificing some of that ease of storage for other advantages. It does very much depend on what your priorities are!
The problem I found with my TT (sunncamp 400se) is when its packed and you need to put something in you have forgotten, the whole thing has to be opened up to get to the lockers.