I like the Prismata style. You have a number of seconds in storage, plus you get a number of seconds each turn. If you use more than the number of seconds you're given each turn, you start using up the seconds that are in storage, and if you use less, some (but not 100%) of the remaining time goes into the storage. With the slower settings, this means that you always have enough time to think when you need to think, but not enough to effectively slowroll. With the faster settings, it means that you have enough time to stop and think for a short while when you really need to if you can make the easier decisions more or less as fast as you can use keyboard shortcuts to perform those actions. You can choose the time settings that you are fine with getting automatched into, and then you can only get automatched into those games, and I believe games played with the faster settings only count as a fraction of a game for the purposes of the leaderboard.