The older collectors and purists preferred the 65 as i do. Especially if it had the ”Bull barrel weight shroud.
The move away from the traditional curved trigger guard to a more angled trigger guard for the later variant of the 80 and its connecting block barrel weights, and longer tang spoilt the look slightly.
However, you could get a tiny bit more out of an 80 on target, with its greater amount of trigger adjustments. The 65 trigger angle was not adjustable, only weight and pull length, you could get a better trigger position going on the 80.
The connector block barrel weights of the 80 wrecked the looks, but perfect balance preferences could be achieved.
However, the 80 simply did not have enough time to prove itself better than the 65 as the 65 had been in production since the 60s and having won everything…Had it been in production longer, i am sure it would have caught the 65 up and past it, but it did not have time to do it before the Gas pistols came along and confined it to history.
Electronic trigger 90s never seemed to catch on and by that time, Gas pistols had taken over.