Personally I choose letter cutters based on the font - if it's a style & size that I can use often, I'll buy them.
I have both tappits and cliksticks... I would say the Cliksticks are much easier to use straight off. But really, tappits are equally easy IF you have the hang of them...and it does take a bit of perseverance and experimenting to get the hang of them. When you get the knack for tappits you DON'T need to pick the letters out with a pin, at all, ever - they come out easily every time with a sharp slap of the cutter on the work surface. But yes, they can be frustrating before you get the feel for them and many people do resort to pin-picking the letters out, which tends to mangle the letters.
If you end up with Cliksticks just remember to roll the fondant thin enough so that the ejector bits are not making any impression in the letter you're cutting out...(I've seen a few cakes pics on here where these marks are clearly visible on all the letters & they really shouldn't be!)
