I'm not thrilled about Major Sweets- but I'd be lying if I said Richter's hasn't given me the best Stay-and-Scream experience in 13-years (well, minus KidZone in 2010 when there was like 40 people for Hallow'd Past, but....)
Last year the crowds were never too crazy, there's plenty of shade even if you're queueing up to be the first in the haunt- and as soon as we finished it was off to the tents and Monsters done by like 7pm at the latest.
It still remains to be seen if Springfield is a mega draw with Monsters as the sole "IP" in the back- but I would say don't sleep on Richter's if it comes back this year. I was a die-hard Springfield supporter- drowning in the torrential rains every year and still singing it's praises- but if Richter's was any slower, it was only slightly- but with a lot less people to deal with.