You can get the gain out of them, but they still have that Strat twang to them, even with high output humbuckers, which IMO is undesirable for rhythms. I love the feel of Strats, but there's something about them that just makes them impossibly hard to sound like a guitar made for metal. Still fantastic lead guitars, regardless, but metal rhythms, I just can't dig on a Strat.
I'd probably go with the Charvel (though, I'd still probably prefer the Ibanez, but not with the stock pickups - I don't care if they're "real" DiMarzios, the IBZs are muddy). Teles are awesome, the perfect combination of Strat feel, mixed with more of a Les Paul tone. Charvel makes a cool guitar, and I've owned the one you've been offered before. Much better guitar for metal IMO