This really comes down to personal preference. I don't like a giant tube because I find them to be a pain to carry around, but I also don't like the tiny compact tubes. I prefer a balance between size and sound. I don't like any flex hose in it. Solid/rigid construction allows me to hold my bow in one hand and tube in another, pointing it wherever I want.
I bought and used one of the newer rocky mountain game calls tubes last year and like it. I've got one of their earlier tubes that is a beast with flexible hose that I never liked to carry. Before last season, I used an Elknut Chuckler (original) that I liked, but I misplaced it somehow. I've got an original primos tube somewhere that is simple to blow, but has such a distinguishable sound that I don't use it. I've not tried Phelps, but suspect it's a good call (I like several of their reeds). The Phelps that I've seen is bigger than I want to carry. They probably make a more reasonable size tube as well.
More nonsense on calling:
The reality is that a vast majority of folks sound like hell with any bugle tube. A small number are decent callers. And a really small number are good. Then you have elite guys that are better than some elk. A lot of folks assume they are a notch higher than they really are. I assume that I'm decent, so I may sound like hell.

The worst, is a guy that assumes his two notches above where he really is.
If you can't learn to use a diaphragm worth a dang, you'll not make it to decent regardless of which tube you buy. That is a lot of folks problem, they suck with a diaphragm, so they go the primos route and can be recognized almost without fail. I'd worry more about learning to use the diaphragm call than I would which tube.