You can be happy with whatever you buy. Some take more work then others. There is a direct relationship with quality and cost, so keep that in mind, but ultimately you can make any of them good fun.
One thing about building a Tamiya is that it forces you to learn about how they go together as you build it yourself. The skills learned building a Tamiya can be transferred to the other tanks. If you are into RC already and have worked on trucks or cars, then rolling your sleeves up and learning about these tanks is an easy exercise.
Cheers