I'm bored, so why not.
In a nutshell...
I. Aeros is basically the Starbucks of SL. Also the most popular for some reason, even though it's No Mod. It comes with a fair bit of options, but I find the HUD to be unnecessarily complicated and too overly fancy. If I have to squint at a HUD for several minutes trying to figure out what button does what, and then take additional time to refer to the extra manual that comes with it, then it's a hard pass for me. Once you actually find the part on the HUD where you can actually skin match the darn thing, then it's just a matter of clicking buttons. I didn't fiddle around with it too much TBH. I'm not a fan of Aeros AT ALL in general and wouldn't personally recommend it, but if it speaks to you and you really REALLY want the porn star Dave look, then go for it.
2. Sensations is another pricey one ($L1500), but comes with oodles of features (as is standard for their products). It's not very realistic in terms of skin textures, but hey, if you just want something to show off with all the bells and whistles and piercings and vintage 80s neon lights and a gold plated chrome bumper strapped on for good measure, then give it a whirl (...or check out the demo HUD first to see what exactly you'd be getting into).
3. ♛ROYAL doesn't have a huge selection (all in the $L600-1000 range), but they have the second least complicated HUD. I mean, it gets the job done, and that's all that matters, right? Again, their skin textures aren't the most realistic, and it's kind of a finicky process to try and skin match. If you're not a perfectionist (like me) however, then this middle-of-the-road option will probably suit you just fine.
4. Virtual Artworks (VAW) has the one with the most realistic skin textures. It is the MOST realistic looking, in general. Their HUD is very straightforward and easy to use. Skin matching isn't terribly difficult; there's no optional color palate to choose your own tint (at least none that I know of), but it gets it pretty darn close. If you want something not super fancy but functional, and still decent enough to look at (because let's face it, the only reason to purchase extra pixelated bits in the first place is because we're all visual creatures at heart), then I'd recommend this one, otherwise go with ♛ROYAL. Or, whatever your fanciful little heart desires.
Back to my cave now.