Yes, the T1s are in a different class altogether than the T90s, but the 90s are going to work better for portable use. I got them ,due to the fact my ear canals can't tolerate IEMs( of any type) for more than a few minutes. The same goes for "on-ear" phones like the DT1350 ,they are portable "wonders", but they start hurting my outer ears after about 15 or 20 min.
Having said all that, I don't listen to portable music (other than CDs in my car) any more. Life is too short to listen to music not being played on my my dedicated home reference system, regardless of how "nuts" I get with my portable rigs. (Don't get old, & particular ; though it works for me)