Granted I'm biased as I'm primarily a scala dev these days but I've always preferred the square brackets over the angle brackets. At least for me it is actually more readable.

Angle brackets aren't even very readable, couple that with the fact that they are also OPERARTORS and you are looking at some major complexity in your parser to distinguish between bracket usage and operator usage (possible, but requires looking ahead, worse syntax errors).

I am seriously implying that one is easier on the eyes than other.