EX2: Soldered parts with Hori clone parts. If anything breaks down, you’re gonna be spending more money into it.
T6 Wireless Stick: No idea about the innards but it’s tiny and again, Hori clone parts.
Joytron Revolution: Dual compatible PCB but I’ve heard stories of it requiring a bit of work before it becomes a good stick.
In the long run, with any of the sticks you’re suggesting, you’ll be investing time and money costing more than a standard level arcade stick. Hori clone parts are better than Madcatz’s SE clone parts but anything with constant wear will cost you to replace/repair parts. The only viable stick that’s really worth it is the Brawlstick, higher quality parts(Stick itself has good parts in it while the buttons are from the Tatsunoko vs Capcom stick which have proven to be good buttons). In comparison to the SE stick, you won’t be required to change parts out of the box.
There’s always the trading post/local classifieds. If you’re tight on cash, go look for second hand Hori Real Arcade Pro EX/EX-SE or one of the sticks you’re looking for already modified(some people actually sell the EX2 with quick disconnects and Sanwa parts for around $80 or less from what I’ve seen). I just found a (somewhat limited) Real Arcade Pro EX-SE Mushihimesama Futari edition(green EX-SE) for $100 mint condition. Much like most of the members here suggesting not to buy the sticks you’re suggesting, we most likely have experience with these entry level sticks and I’m sure you’ll have regrets later on when something breaks down or isn’t working probably.