Im going with provari theyre more popular
Who cares if they're popular or not. Get what works for you.
If you can break a Darwin 5 times in less than a year...I'd suggest getting something simple and cheap...LOTS OF THEM.
If you need/want lots of power...consider a cheap box mod with a good VV regulator.
If you think a Darwin is fragile, wait till you start messing with battery chargers and things with tabs/threads/springs that you have to open and close at least once a day. Even the best chargers out there are susceptible to all sorts of damage when you start hauling them around.
Maybe a Darwin isn't for you. If you can break one that frequently and easily...maybe high end mods, especially those without lifetime warranties aren't really for you either? Oh well, it's your money. I do hope you find one that suits you. Sincerely....who cares what is popular. Find what works for you