Why not install both!
its quite easy you know,
1: Create an Fresh Installation of SH3
2: Update the Fresh SH3 to 1.4b
3: In the Map Ubisoft Copy the map SH3 and Paste it next to it (it will take some time to complete +- 10 min)
4: Rename the Folders ex: SH3 + GW and SH3 + NYGM
5: Install both Mods on the correct named SH3 folder
6: And you have 2 SH3 Games Modded!
7: Only be aware that the Save files will be in the same folder (My documents > SH3 so remember wich save you use with that mod!
It takes maybe a little more Disk space but if you want to play both! its worth it