Unfortunately pretty much all the small PT boat types, and about all the navies had them, were roughly either equivalent to the PT we already had or were less then performance-wise. A few were faster but not by much and more lightly armed.
The best was probably the German "S" boat only cause it was the only one that ran by diesel and was most sea-worthy. But even that had a small number of cannon, torpedoes, and machine guns. All of them had speeds in the 40 to 45 knot class. Not much different then the one we already have. I cant think of any PT boat in WW-ll more heavily armed then the late war one we have. The German one was so good cause it didn't catch on fire like the Gas operated ones of other navies.
There was an incident right before "D" Day where a number of German "S" boats happened upon a lightly escorted Yank LST group that was practicing for the coming invasion. The Germans killed a whole bunch of Americans so the boats were plenty lethal. At least against lightly armed LSTs.
Like the others here I dont see much point in bringing more boats like this in when we still need so many aircraft. Like the TU-2 and Beaufighter.
