I agree with levers being the most simple/long lasting, but would imagine one wouldn't fit the work flow for many people. Unfortunately some want push button (volumetric) convenience/repeatability.
There are plenty of quality brands on the market and choosing one is just too subjective. Any machine is going to require routine maintenance/cleaning, etc. Parts like group gaskets, shower screens, steam valve seals, etc. will have to be replaced periodically based on use and wear/tear. I'm not a fan of touch screens, volumetric controls, etc. I like a simple/high performing/dependable workhorse that never lets me down. In business I used a 2 group Nuova Simonelli Aurelia and have nothing but praise for it. That machine just worked hour after hour, week after week, etc. with not much more than a good solid cleaning schedule. In over 2.5 years of quite heavy use in a mobile setting (traveling lots of miles weekly, which could make a difference compared to a shop setting) I never had a single issue with it. Surely there are others on the market that would have fit the bill in my situation, but the Aurelia was what I had and it was a fantastic machine in terms of build quality, performance, recovery and longevity.