lht vs. 520 debate goes on - both have solid reputations with their stock components.
imho - get the bike that fits or feels better to the rider - then ride it & replace the components
as they wear out. i was fairly fixated on getting a lht. then after riding both, the 520 felt more responsive and
spoke to me in a way the lht didn't. a few thousand km on my 520, have only replaced the chain, plus a couple tune ups - wheels still true and smooth.