I have all 3 .exe's and prefer always to play with BI. Not necessarily because i think it's smarter. I just like BI options like hording and such. Since i'm always messing around with my install. It's more fun playing around with BI options in EB. I honestly do not think there is much difference between the .exe's in terms of which one is smarter. The only plus side in alex for me is perhaps your prone to see a bit more retraining and the larger DMB is also plus if your going to add a bunch of units. Other than that though......I fail to see this remarkable improvement in how smart the AI is as some would have you believe.