I have owned both .
What works best for us is an 8 foot wide 21T Komfort with no slide .
We pull that with a 2002 diesel supercab short box pickup with a SnugTop locking canopy .
We bought both new and have kept them twice as long as anything else we have owned.
That configuration gave us a 14 % ( 8' /7') increase in space while maintaining a shorter length .
We pulled our 7 ' wide Nomad 1661 significant distance and it was easier to tow but we wanted more space and the Komfort is taller as well as wider .
We also owned a 26 foot slideout trailer and we have found that the 21T works better for mobility and for the type of camping we prefer , which is without hookups.
For me , it is all about the Tow Vehicle .
The right tool for the job is a 3 /4 ton / 2500 pickup because the payload increase allows me to use a Heavy Tongue Weight which is the number one factor in safe handling in adverse conditions .
The reason to use a 7 foot wide trailer is because of a half ton pickup or less . If a 2500 pickup ( any brand ) is used then the advantage of an 8 foot wide trailer is a better solution .
