I flew a Tiger 60 with a ST 61 on it for quite some time. Absolutley loved it.
I've flown but never owned a 4*. They to are great flying planes.
I would recomend the Tiger, but that is just my opinion. Both planes fly about the same and have the same general flight abilities. I think it boils down to which one looks better to you.
If you wanted a four stroke the New Saito 82 would be just about right for either of these planes. Agian thats just my opinion