Depends if you're going for looks or performance. If you're just worried about looks, a larger spacer in the rear will look better. The problem is that you're increasing the track in the rear more than the front, which will induce understeer by increasing rear grip more than front grip. For that reason, I went with 15/15. Were I to do it again, I might go 20/20, but I'll make the final call once I get some SPL rear camber arms and get the rears dialed into a reasonable amount of camber. I just lowered the car on KW Variant 1's and I'm at something like -3.4 degrees in the rear (and about -2 in the front).
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