I have all of them. I tend to alternate between the vantage and RR (pulse is dull and the STU just did nothing for me). The Halloween alien one is good, but it’s all about how you use them and what you want from them. I find using the same one on successive days gets less stimulating, but alternating keeps things fresh. I also try to not have the grip too tight. I generally prefer Quickshot sleeves to Fleshlights and have made an adaptor to use them on OSR2+.
One other thing, for asymmetrical sleeves like RR, mix things up by turning upside down 
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