Version 1.5 changed the game's handling of traffic completely. 1.4 tracked every single ship on the seven seas, tying up mucho memory, causing corruption problems galore and markedly slowing the game.
1.5 began a "virtualization" of ship positions. Instead of tracking every ship, SH4 knows how many ships are in each sector. Only when you enter contact range are these ships actually rendered and tracked. It's like Schroedinger's Cat times several hundred. Each ship not precisely tracked increases available memory and clock cycles to make the game run smoother and faster with fewer errors.
That alone makes v1.5 worth buying, even if you never look at a U-boat. Also just about every mod out there is made for 1.5, not 1.4. Basically 1.4 is obsolete. It's not worth keeping.
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