What electronic paintball marker is most reliable and why?

Well if you are going to play woodsball I'd go with a Tippman. If your going to play speedball I'd go with a smartparts gun. I have owned a smartparts gun my friends have also. They break hardly no paint. If your eyes broke they still dont break paint. Oh and also the reason you could be breaking paint is you might need a large bore size barrel, or possibly your lpr could be to high.

Get an Ion for good reliability, a Shocker for great reliability. I loooove my shocker to death. It never breaks, easy to maintain, and shoots fast, quiet, straight, and did I say fast? And I have NEVER chopped a single ball. Bob longs are good but loud, and Ego's kick like a mule, I never like mine (had a few, trying to get to like them)

Most electronic paintball guns with eyes wont break much paint. I have an Smartparts ion and a spyder VS1 and Ive never had an issue with chopped balls. The main reason for it is because they both have eyes that wont let the gun fire unless there is a ball in the chamber. I don't know if the omen has eyes or not, but look for a gun with them.