LOCA versus OCA moving into the future?

As a precursor to this question I want to state that I have very little knowledge over this topic, I have just started some preliminary research before deciding if I want to invest in starting iPhone repair. In doing this research I have noticed comments of LOCA being less applicable to the I6 line and above, as well as some other attributes I have noted below...

LOCA - Messy, can ruin backlight, not great for iPhone6 and above.

OCA - Equipment is expensive, bubbles are difficult to avoid (even with said equipment), touch sensitivity is altered at times (possibly due to replacing polarizer).

RESPECTFULLY, I ask that only people who have been in the business multiple years, have used both methods, and would consider themselves knowledgeable reply to this question...

If you were to know what you now do at the time you started repairing iPhones (with the assumption that this technology was around) what methodology would you choose?