XTX are about the same size as the TX, with a smaller purge button that I don't think I'd go for with thick gloves on. The TX on the other hand is a lovely piece of engineering which just works, and keeps working, you treat it like crap and it keeps working, in fact I don't think I've ever managed to break one. Which is quite something.
Tha ATX would be alright as bailout or as an octo etc., but for using them all the time I'd go for a TX.
Oh, and you might as well have 40s. They're the same as 50s but without the knob to spoil all the hard work setting them up right
Digs.