Think about it for just a sec. Outside of doing every possible model of every plane, there has to be some compromise in what HTC models.
Doing the B25 what was the best bang for the buck in regards to both MA and Scenario use.
They gave us a B25C glass nose version. Think about what that covers. Early PTO,CBI, North Africa, MTO, Aleutians and the ETO with the RAF. No tail guns.
They then give us a modified B25C1 strafer. That covers the 5th AF birds that put the B25 to such good use. Keep in mind they flew the C/D strafers well into 44.
And they gave us a B25H which covers the PTO, CBI and is a pretty good stand in for the earlier B25G if you really want a cannon 25 in an MTO scenario.
Then think MA. Which B25 version offers the most usability. The B25H. It's got all the firepower you could ask for and it has tail guns. It carries bombs, lets you fight the tanks, and has plenty of MGs to shoot.
If you want to give someone a face full of 50s, take a 25C strafer.
I guess I must seem like an HTC apologist, but I'm of the opinion they did a pretty decent job on deciding which 25s added the most variety and punch for both Scenario/FSO/Snapshot use and the MA.