I am fairly new to SH4 myself. First, I would recommend to have multiple installations if your hard drive space allows it. The advantage is that you don't have to re-install SH4 each time you try a new mega mod.
Download Multi SH4 and follow the instructions there, you can have as many installations as you wish limited by your hard drive space of course.
I tried TMO first and then RFB. Well they are totally different and I like them both. You have to find out what you like better. Both Super Mods seem to be more interesting if you combine them with RSRDC which gives you a more challenging campaign.
Don't waste your time and play just "stock", what you need is version 1.5 which only comes with the U-boat Missions add-on.
Good Hunting
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