A yellow Medi clone? I can help you on that one!
They are almost
exactly the same size. The yellow one is obviously the Medi, and the white one is a SS Phase I with his arms posed to match the Medi's.
The Medicom clones are lacking in articulation due to their tight vinyl armor over their spindly bodies, in combination with the fabric suit... The Medicom clones can't put their arms further down than what you see in the pic (although the SS clones can)
If the Medi Commander is cheaper than $90, then by all means, he's worth it! They can be displayed nicely with SS clones, but because of poseability issues, I wouldn't say they're worth more than a Sideshow trooper. You can get the plain white SSC Phase I's on eBay for around original price BIN...
Personally I enjoy displaying my Medi commander giving orders to my 3 white SS troopers, he really looks great if posed right. (I usually try to make his arms look intentionally raised, so he doesn't look so awkward... works well with pointing and gesturing and stuff.)
Anyway, hope that helps, speedy!