This or similar spec, power and price Hypex design?
We are pleased to introduce the MPA-M500NC, a mono power amplifier based on a NCORE NC500 amplifier module.
www.audiophonics.fr
Some of it is price dependent - prices are going to vary by location.
I'd probably go with the Outlaw, just because I have an irrational liking for old-school amplification technology.
On a practical note, I don't really think the Hypex alternative will be an appreciably better amplifier in practice. It's more powerful (but not by a huge margin, and both are pretty big amps). Both amps have distortion low enough to not matter, and the efficiency differences between a class G and class D likely won't be noticeable in a domestic environment.
I would tend to give more preference to any company that designs their own amplifier rather than putting an off-the-shelf module in a box, however. Someone who is less of an analog electronics nerd might not care about this, but I'd rather give my money to people designing amps rather than buying amps, putting them in a box, and reselling them.