Any metronome will work, as long as you can quickly and easily adjust it. Volume control is nice (I assume you're using in-ear for this), but I don't think many of the fancy features are really necessary- subdivision, etc.
Also important is the ability to shut the metronome off when your band gets off from the click a little. There's nothing worse than when the drummer is fighting with the band.
What might work better for you (depending on you and your preference) is a tempo meter. Something like
this would allow you to keep track of what tempo you're actually going, rather than give you an arbitrary click that you're slave to. The nice thing about it is that you can do accelerandos and ritardandos quickly, easily, and accurately.
Just some thoughts.