Best for one may not be best for you. It’s all about preference and application. Stock and cheek weld play a big part in height of optic. Then there is if one likes large picture window or minimalist. Best advice is try different things or get with people that have variety to get better feel for what’s right for you. Some just don’t have disposable income to buy something just to find out it won’t fit their needs. I’ve went so far as taking something to my LGS and asking if they mind me mocking up one of their display optics. Currently I have an MP5SD, G36, and UMP45 with MRO’s on tall risers. I have an MP5 with an M4’s on a stock HK mount. Then I have a K-PDW that has an ACRO on a single point mount that is low/compact. Of those, I like the MRO up high the most. YMMV.