Disk brakes

So if I go the disk brakes route thinking Lynskey. Option for mechanical or hydraulic, what is the better option? Are either of them really all that hard to keep working with properly? Seems if you have bleed hydraulic that would be a little more but nut rocket science.

Finally I really do fine with standard rim brakes but seems the future is only in disk. I can only see a downside to rim brakes in going down long mountains and heating. Rain would make them better too. Could all be completely overblown too?

Deacon Mark