I've had both and both are great second planes. You may also consider another one, a Tiger 60 ARF. That was my second plane, and I still have it and still fly it. It gives you great visibility (size) and flys like a trainer but with more capabilities.

My original setup for the Tiger 60 was an OS 61 SF that I bought second hand from someone. That engine, by the way, is still in use by Overbored in his remake of the Tiger 60 (he built a kit version and made some very interesting changes). I gave it to him to use and he loves the engine.

My Tiger 60 now has a Super Tigre 75 with a MACS tuned pipe. Very VERY capable plane. Still doscile when I need it to be, yet very aerobatic when I want it to be. No, not 3D, by the way. Someone says '3D is for movies'.

No matter what you choose, Tiger II, 4* 40, or Tiger 60 (even 4*60 by the way.. great choice) you can't go wrong.

I added to my Tiger 'fleet' by the way, by getting the new Tiger 120. It's a tail dragger configuration, OS 1.20 AX. One problem is that it needed quite a bit of added nose weight to meet the CG, but it flys typical of the Tigers. Just great!!! Much slower (becaue it is much larger) than the Tiger 60, but imagine a Tiger 60 in slow motion.. .

DS.