Choosing between Air Serbia (longer layover) or Austrian (shorter layover) for NYC > Bosnia/Montengro

Planning a trip from NYC > Sarajevo with a return flight from Kotor > NYC and having trouble deciding which flight option is better:

Option 1: Air Serbia, with a 3.5 hour layover in Belgrade. Pros are the longer layover so no stress about missing connection and it also flies out of the closer Kotor airport (TIV) as opposed to TGD. There’s also the added option of an overnight in Belgrade. Cons are the reviews - I had a horrible experience last summer choosing a budget airline (Norse) vs an old reliable and promised myself I’d never put myself through the risk of such shitty customer service and experience again.

Option 2: Austrian Air, with a 50 minute layover in Vienna. Pros are that this seems like the more reliable airline. Cons are the stress of wondering we’ll make the layover in time, plus the return flight flying out of TGD rather than TID (only a 15 vs 90 min difference, but still).

Typing it all out I feel like the answer may obviously be Option 1, but does anyone have any first hand experience of flying Air Serbia internationally? Are they reliable? Is there anything else we should be considering?