1. Ties are horrible. The goal of a competitive sport is to crown a victor, not declare a "tie". Anything but ties. Can you imagine a formula 1 race "hey, you guys both crossed the finish line around the same time, TIE!" - so dumb.
2. Continuous 5vs5 OTs are great, but I think it's too much for regular season. First, it diminishes how special playoff OT is. Next, it can get a bit silly, with regular season games going to 3 or 4 OT or more...it's too much. And I agree with poster who said it creates a dilemma for TV rights/scheduling and flights, could be hard to manage
3. I also think 5 mins of OT is way too short. Even at 3vs3, 5 minutes goes super fast
So taking all that into account, I voted 10mins of 3vs3 then shootout, but I'd probably prefer going 20 mins of 3v3 OT. The idea is to lessen the amount of shootouts, but not eliminate them, so not sure if 10 or 20mins is best.
Honestly - I don't mind the shootout. It's fun, different, and unlike soccer (huge nets, its stupid) it's always actually a pretty big question mark if a player will score or not.
The two biggest problems with shootouts in the NHL is how points are done (most agree, NHL should switch to 3 points for regular win, etc), and the fact that shootouts are too common. Make the OT longer, it fixes that.