First - the monoprice adapter ($11):
This one works well - though it is NOT compatible with the HTC dock.
The best charge rate I got in a half hour: +179 MA
This result is better than on any of my previous tests, I'm a little surprised the result was so good for the monoprice. Using movies on my card through dice player - I believe I could play for at least 10 hours straight without running out of phone battery (stock). There's a little drain, though streaming would burn battery much faster.
Next - the EBAY adapter ($6):
It appears the price has gone up since I bought it - but this one works great and DOES fit the HTC dock perfectly well.
The Best Charge Rate was +209 MA
Which is great. I was first shocked to play movies on it - and see that my phone got fully charged.
Next - The Phonejoy Video Game adapter ($12.90):
This one is a tight fit with the HTC dock, it makes me nervous to use it long term this way - because I think the dock port or the cable will fail.
However - it includes a full HDMI port (no cable needed) -and is designed such that the long micro USB cable puts little strain on your phone while gaming. It's a good design, but the only drawback is that at 3FT the cable is really too short to game on a big TV.
The best charge rate in a half hour: -9 MA
You read that right. It drains the phone while using it - I couldn't get it to charge for some reason. A definite negative.
Finally - the Samsung adapter ($25):
It fits the HTC dock. It's certainly the prettiest, it's smaller than the others, glossy and feels expensive. Which at double the price (at least) - it is. But who buys electronics for the looks? Not I.
The best charge rate in a half hour: 219 MA
So the Samsung did charge the best overall. But are the extra 10 MA worth paying $25 instead of my $6 eBAY special? I don't think so.
I'll try to be detailed with a post later in the weekend, but right now - I see no video output difference using the EVO 3D. If any of these adapters has 60FPS capability - it's not with a stock device. I've been playing 720P videos and 1080P videos at 30FPS using Diceplayer - and noticed no quality differences. I've tested 3D videos on almost all of them - and they work great on my passive 3D TV.
In short - right now, my $6 EBAY special is proving to be the best bang for the buck and unless I see better video quality in gaming or other content this weekend, the Amazon adapter is probably going back. It's possible that other adapters have lower quality - but the 4 above that I've personally tested seem to work equally well at video output, with the only differences being fit and charge rate.