invertor - yes. I believe nowadays 90% of new fridges you can find already with inverter. It makes more sense since your fridge will be on 24/7. unlike aircond which still have some argument to go non inverter
brand - generally most are ok, depends mostly on your luck. just avoid LG fridges with linear inverter compressor, got well known issue.
tech - up to personal choice. more tech = more expensive = more chances of something to go wrong in the long run