As long as they are newer magazines (newest design), they are interchangeable between the SF and regular line. I think the difference is whether or not it is a ambi mag release, but I am not 100% sure on this one. I don't even think they make an ambi mag release in the 30, I thought it was just the 21, and then only if it has to doohickey, picatinny, rail? Like I said, not sure on this though, I am sure someone that has more Glock knowledge will chime in here soon.
I have an SF 30, but a regular 29, and it is not enough of a difference for me to get one over the other. I bought the 30sf, cause that is the one they had, and I bought the 29 cause they didn't have a 29sf.
I have a 29SF and it's a similar size to the 30SF. The only difference between it and the 29 is 3mm from the front to back strap. As already noted, just try to hold both of them to see which one is more comfy to you. The SF just felt better to me. Oh, the mags for the 29 and 29SF are the same.
I have a 30 and it fits my hand just fine. I have long fingers. I wouldn't need the SF. Try them both out. See which one fits your hand better. If you like the 30, let me know. I may be looking to sell it.
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