I'm looking for a new amp, and my eye has dropped on 2, the VOXAD30VT(-XL) and the Cube30X. Now I have 2 questions:
1.What would you choose?
2.What's the main difference between the regular VT and the VTXL?

For 1, you should know I play a whole lot of styles, fav band is Muse, I also love The Cure, Radiohead, Bloc Party, Kings Of Leon, RHCP, The Strokes, The Horrors, The Sonics,...

Fender Jazzmaster
Boss DS-2
Digitech RP150 (with Line6 EX-1 Exp pedal)
Orange Crush 30R

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They're both good amps for the price. I would say try them both and see which one you like better.
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The XL is the hard rock/metal version of the Valvetronix series. Judging by the bands that you listed, you probably want the regular VT, but try them both. And look at the feature lists.
Ibanez SR-500
Schecter C1 Blackjack
Ibanez GSR200
Classical acoustic

G&K Backline 600 + Goldline 210GLX cab
Vox AD30VT
Crate G40C XL
Crate BT15
EH Metal Muff
Digitech Grunge
Danelectro Fab Overdrive
M-Audio Ozonic
Tascam M-308
the regular vt sounds LOADS better than the xl... i speak from experience!
05' G&L S-500
95' Godin LGX

96' Yamaha APX 6-A

Peavey Classic 30
Maxon OD808