Could you post some tests using both?
Tests were done using example games available for each... Test results IMHO are really moot for this as it solely depends on processor speed, etc. For me, in pure software rendering Jamagic still comes out on top, especially on low end systems.
I have heard that the jamagic logic code is really slow.
Blitz IS faster, but Jamagic has never given me speed issues for games. Each language is different and requires a slightly different approach to get the max speed.I would never consider Jamagic for 3D, but IMHO, for 2D games its fine.
I don't really do much game wise anymore and only am doing apps. Until Blitz Plus got the native graphics, I had been using Jamagic or IBasic for apps.
The only real bonus Jamagic has for apps over B+ is Jamagic is crossplatform. It is nice to be able to write a PocketPC version of an app in the same language as the PC version...
"IF" I were to do any more 2D games that required speed and decent FPS, I would likely use Blitz Plus and its OGL, which has been phenomonal in all tests I have done.