Tips for a tube amp?

That's a great question, and one that's difficult to answer without a little more information. It sounds like you have the choices narrowed down to your three favorite, and they all seem to be from reputable companies, but since the most important thing in this decision is sound, I would ask you what tone you're looking for.

I would then suggest going to YouTube and looking at several videos that demo the amps you're considering, and see what style of playing is most in line with what you'd like to do. Sorry if that's vague, but I think the most important factor in this decision is to start with tone, which is a subjective metric.

Yeah, it sounds like there is no wrong answer. The Fender seems to be the least expensive of the three (assuming you're in the US), but I'm personally a sucker for the Vox, especially if you'll primarily be using the clean tone. I think this vid does a decent job of showcasing that amps clean potential. https://www.youtube.com/watch?v=tARaVyhycTE

While I love the Orange's crunch, I think the Fender and Vox beat it on clean.

I love Fender amps 😄 Here's a cool video Fender put out about the Super Champ X2:

https://www.youtube.com/watch?v=J9Dm1IVoSjk