If you buy at a decent price both are fine. I'd advise against buying at full RRP unless you're sure it's a keeper
The new Autavia is a tad chunky for my small wrist and I didn't like the polished effect when worn with the BoR bracelet.
The Monza, although I like it, is not for me in PVD/coated style
If your budget is at full RRP or a bit more, I'd buy a vintage Heuer in your position - there's been a few on SC recently