It's a matter of opinion.
When kept stock, Tokyo Marui guns have the most reliable internals. A stock TM will run for years without needing any work done to it.
Having said that, TM bodies are plastic and don't stand up to abuse well. If you're planning on replacing most of the internals, then spending the extra money on something like a Classic Army gun (though which also has excellent internals) might not be a bad idea. If you don't abuse your guns, don't mind a plastic body, and want a gun that will last a long time kept stock, than TM guns are great.
"Someone in a Prius tried to race me at a stop sign the other day. I couldn't believe it. I had him for the first 100 feet or so but I can only walk so fast."