That's true. Blitz basic was slightly faster but not as user friendly. The one great thing about it was the fact that unlike Amos, it didn't take over your computer. When Amos ran, it ran on top of everything else* whereas Blitz multitasked and interacted with anything that was running - and also could use native Amiga windows, interacting fully with 'intuition' (intuition being the technical name for the full workbench GUI).
Blitz on PC is slightly better than Dark Basic IMO. Both have demo's so you can try them out though.
* = 3rd party additions have made it possible to make limited use of intuition from within Amos.