The Keltec RBD is an excellent rifle - significantly less ($) than the Tavor. Its really neat to see those ejected cases fall straight down. If I were going to buy one I would start out with the Keltec.
I had an RFB and played around with the RDB and in terms of quality, my Tavor X95 just seems so much nicer. Also, you have had the Isreali government spend millions on R&D for the Tavor series of rifles, the RDB being a new design does not have the same luxury of being backed by a government.
I have both KM arms 5.56 and .308. They are MOA guns with my handloads. The trigger is a thing of beauty. Aprx 3 1/2 lbs. They are a local manufacturer in Chandler. You can pay a visit and check it out. The owner is a really decent guy.
Dogslayer
Agreed. The Tavor x95 is not front heavy at all (though heavy it is). The weight is all in the rear of the gun. I can easily seat it in my shoulder with one hand holding a forend and change mags Etc. And that's with the Saker on the front. It actually feels the most balanced with the suppressor hanging off the front.
Go pick one of each up and handle it. See which one feels better to you. It's all about you. They are both battle tested by other countries. What it comes down to is can u feed it, clean it and get parts for it easy.