Because the price on Amazon via SubSim are so dirt cheap I have SH3 StarForce free patched to 1.4, SH4-UBM, and SH5 all installed and modded.
I have the best of all worlds and, while I play SH3\GWX the most. I bounce around and play the other 2 as a change of pace.
Each 1 is unique and different in it's own way.
As I noted above if your computer can handle it. Buy all 3 and you'll see. they're all GREAT in their own way. And moddind them makes all the difference in the world.
Regards FIREWALL.