Floor for the whole package, including integrated headphone amp control. Since the helix can act as a good sound card for your pc, the mic in is very usefull too
If your primary concern is space (and you use simple signal paths), stomp is the way to go
Imo LT isn't worth it, even more so if you have to buy additionnal gear to compensate for it's "lack" of features (like a separate headphone amp, a soundcard for a mic, etc.).