There's really no objective answer to this. Any reasonably recent bike should be pretty reliable. My KTM 790 has been very reliable for me (after I sorted out the problems caused by aftermarket electronics) though others will tell you all sorts of horror stories. Likewise BMWs, some swear by them, others will recount tales of broken swingarms, failed drive shafts and burned out fuel pumps.
But as a rule, simple is good. Not only because it *might* be easier to fix, but also because there *should* be less to go wrong in the first place. But don't go Luddite. Electronic ignition has been standard for decades with a great record of reliability, and you won't find anything from this century without electronic fuel injection.
My current option, chose mainly for reasons of (relative) simplicity and reliability, is the XT660Z. Time will tell if it was the right choice, but there's a lot of owner experience out there which makes me hopeful, and being a Yamaha there are a lot of agents around the world if anything does go wrong.
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