The biggest difference between the XVIII and XXI is indeed the H2O2 and the batteries. The turbine design provided higher speeds, but the fuel was not easy to come by and didn't last long. The XXI wasn't able to see the same speeds as the XVIII, but with all the added batteries, it was now faster underwater than on the surface. And with a snorkel, this allowed it to be the first true submarine. So the biggest difference is speed and range.
I personally like the XXI because I still only rely on diesel/electric power. It comes down to a decent passive bonus(XXI) or a limited awesome bonus (XVIII) in speed and power.
And I have the snorkel and hydrophone working together now for both the 18 and 21. I didn't want to post it yet though since this is based off Xant's work, I wanted his permission. I'm going to try to add the Type XXI as a separate submarine if I can so you can select either in your career rather than be limited to one through the mods.
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