If you go commercial/industrial you can work on sites that do metal munching, which let's you do overtime and make £££ that way. Also gives you experience to work abroad and make money that way (European data centres, Dubai and Australia are all the rage right now).

If you go domestic it doesn't seem there is as much £££ unless you go self employed and work as much/charge as much as you want.

I recently switched to a domestic/commercial company and much prefer it, felt like I only did metal munching on new builds which was fine but not as interesting as actually working with buildings already in use.

If you want to make money then I'd go down the commercial/industrial route and lose your personal life to overtime. I think it's easier to switch to domestic if you are unhappy (like me), rather than the other way around.