Wow...lots of feedback

I've just hooked up the two keyboards--Aivia Osmium (Reds) and DAS Professional S (Browns). I've done a few typing tests on line and neither one seems to affect my speed much--pretty much in the 70-75 WPM on either one, so I guess I have to bone up on my typing skills.
The DAS is a much more elegant design and I think I VERY slightly prefer the feel of the brown switches--but we're talking about 10-15 minutes of testing time at this point.
The Osmium is less elegan, but flashier, with the backlit keys and other features. It has a lot of macro program-ability (25 macros), but i really don't need that, at least right now. I've thought of possibliy setting some simple typing macros up for emails and Word docs though. Osmium also has scroll wheels for backlight and sound volume...I can take them or leave them. Osmium also has a USB 3.0 (passthrough) connection on the keyboard, as well as audio jacks. Again, nice features, but I haven't any real use for either at this time--I do have 2 USB 3.0 ports on my computer, but currently no 3.0 devices. I have a nice hi-fidelity sound system (amplifier, speakers and subwoofer) hooked up to the computer, so I don't want bypass that for headphones.
I slightly prefer the Osmium's layout--it has a "regular" sized Ctrl key where the DAS has that space split between a smaller Ctrl key and the Fn key.
Annoyance: the space bar on the Osmium is about 3X as loud as the DAS and about 2X as loud as the rest of the keys. Typing is constantly punctuated by the loud "CLACK" sound of the space bar. If I had to choose which one to keep right now, I think it would be the DAS just because this noise is so annoying. Is there something that can be done about that? I like the SIZE of the Osmium space bar--it's a little wider than the DAS, but the noise is bad.
Build-wise both seem to be very high-quality. The Osmium is about $9 more than the DAS, so that's pretty much a wash also. And both are a great improvement of the membrane-syle Dell keyboard I've been using. (Just as an aside, I was typing on my notebook earlier today and I actually like it's keyboard a lot too. Very short-travel "flat" keys, but real easy to type on also.)
I'm noticing that the Osmium's Cherry Reds are VERY easy to press--if one could develop the proper light touch, I think you could really fly on them--but probably true for the Browns also.
TIA for any advice or observations