While the top priced SE/30 today exceed the top priced Classic II, for the unrestored machines there is a lot of variance. You can find Classic II for sale on eBay for close to $400, but at times also find SE/30 for under $200. A lot depends on condition and whether the seller is a member of the classic macs cartel. There is a lot of screwing going on in the exchange of old macs. In the early 2000s, Classic II were consistently more expensive than SE/30.
There’s also a nostalgia factor that comes in waves - many people who want to relive the glory days want exactly what they had when young - others want the hot rod they always dreamed of.