Maximus is going in my all-in-one-cab-in-a-control-panel... hyperspin is just too flashy, too busy, and too much. it dazzles on first sight, but for everyday use, it's just plain unnecessary. even if they had themes for every game for every system i still wouldn't want to use it.
perhaps if i were putting my system on public display and trying to sell it, i'd use HSpin
My personal vote is MaLa. It strikes the right balance of pizazz, configuration options, feature/functionality and overall performance.
I agree with swaffar, HyperSpin is just too flashy and over the top. In addition, HyperSpin is not as configuration-friendly as MaLa and some of the other top FE's out there.
For years I have stayed away from the FE's, and stuck with Mame32.
Don't let any of the FE's fool you into thinking they are EASY to setup. While this might be true for some folks, if you have any incling of creativity and attention to detail, you will sink a ton of time into getting an FE setup and configured for your situation.
With that said, having spend a ton of time with MaLa (and some other's out there), I am extremely pleased with the end result.

The MaLa setup I have simply rocks, and has Mame and Visual Pinball all bundled together nicely in one cabinet. A lot of little gotchya's along the way (Mame, Visual Pinball, Mala, WinXP, Dual Monitors, etc) have inspired me to put together an extensive user manual which I hope to publish.
If you are considering using an FE to spice up the arcade experience, be prepared to spend some time. In the end, it would be worth it!
David