The Surikarn Edition is the one you can't get anymore. I was lucky enough to get one when I did.
As far as I know, the major US distributors, like Great Planes/Tower Hobbies and Horizon can no longer get the car. I don't think SpeedTech can't get it either.
It was a limited edition run. Same goes for the Hara Edition.
If you were able to get either one easily, it's really a toss up.
The Surikarn comes with more options out of the box. It basically has all the tuning options (Front One-Way, Spool, Center One-Way, Center locked pulleys, all the Sway Bars ).
The MRE, I believe, just comes with the locked center pulleys and spool. That's the perfect setup for asphalt anyway.
Both cars require a diff to be purchased to run it on carpet.
If anything, I think parts availability is better for the Cyclone cars as most of the breakable suspension components are HPI Pro4 parts. Most shops have those items and all the major distributors carry parts. Not to mention, if you plan on running carpet, BMI is releasing a carpet chassis kit that makes the Cyclone that much better on carpet.
Hope this helps.