Re the big splits / big single. I recently got (and am waiting for a replacement for) my ibanez EHB1505 which had big splits. I have big singles in my SR1605 and 2605, and they were my favouritist pickups ever up until that point. I didn't actually realise the 1505 had big splits because they look exactly the same and sound very similar to the singles - ie, not the same, but no more noticable than the difference between sound of the 1605 and 2605 which are both the same pickups.
THe only time I noticed is doing a back to back on sound and noticed that the 2605 was picking up noise from somewhere, most likely monitor noise, I posted on here that it was odd and someone pointed out they were splits rather than singles.
So yes, they sound the same but have no noise.
I would say I never really had an issue with noise in the first place, apart from getting to close to a valve amp that I rarely use, but with all other things being equal (i don't know prices / availablilty) I would pick the splits over the singles, but not be unhappy if I got the singles!