A Bandsaw would probably be more suitable.

Abrasive saws will handle steel, but not aluminium.
Chop saws will handle aluminium, but unless it's pretty slow and very sturdy, and you buy a suitable carbide wheel, it won't handle steel.

As for accuracy, that come mostly down to the user. Better built machines will make it easier to cut straight, but still need a bit operator thought to make cuts where you need them.