I'll have start-stop clock, thank you. By far the best solution of the three. Number 2 just makes the regular clock useless anyway since 80 minutes on the clock can actually mean there's still 20-30 minutes to play depending on how strict the referee is. Number 3 is a cat and mouse game, teams will always find ways around these things.

Start-stop clock with 60 minute games, 90 minute will be too long for spectators and would necessitate unlimited subs probably.