I think at the very least I'll feel a decent base level improvement with any option, but multi-threading seems important here. A 4-core 2.8ghz will be a 15% improvement on multi, but the 2.2ghz 6-core is 73% improvement (based on geekbench scores). I'm heavily leaning on the 2.2 2018 at this point.
Not sure what was driving the "feeling good" snappiness in the store model. GPU? Just better CPU clock speed eliminating any stutter? Faster ram? Either way, felt nice, but that was with zero load involved.
Go with 2.2 eyes closed. Very good combination of performance and money, for the ones who truly need it (like you).