Timed ball save - This is nice, since it allows you to flail or take pot shots at some of the more dangerous shots until time is up. I usually adapt and try to gain control as the ball saver is about to end.
Restart shot - gives you a chance to make one clutch timed shot after draining all but one ball. .. the stakes are high!
I generally like my games more punishing, so I do like restart shots to a degree. At the same time, if I get to a difficult-to-achieve multiball, nothing's worse than draining immediately with no ball save. I'm curious what other people prefer.