Tamiya Tiger I was my first Full option kit. It is an easy build and a good runner. I have the Tamiya Tiger II as well and it has been fun to build as well. Has the same electronics as the Tiger I. The only thing I will upgrade or replace on the Tiger II is the track tensioner. I wish Tamiya had used the same system for the Tiger II that they used on the Tiger I and the Panther. It works so much better. Other then that the Tiger II is a good runner as well. Both have enough room inside,but Tiger I has the most space.