they're all the same. the rating difference is just due to the randomness of people buying and reviewing from different sellers and having different opinions. this was the "official" link back when it first released for preorder in september 2017:

https://www.amazon.com/gp/product/B0748S1VDC/ref=oh_aui_search_asin_title?ie=UTF8&th=1

like someone else said, this specific controller has been discontinued. as far as i know, 8bitdo never gave a reason why. but it's been speculated that nintendo forced their hand due to it being so close to their original design/copyright. there's a new model that goes by the "G Edition" name but has a slightly different design with the same internals. the original design is miles better imo.

anyway, i highly recommend the controller. i've had it since release day over a year ago and have used it extensively on both my pi3 and my switch. just make sure you update the firmware when you get it.

https://www.amazon.com/8Bitdo-SN30-Controller-Windows-macOS-Android/dp/B0748S1VDC/ref=mp_s_a_1_4?adgrpid=64518799148&gclid=EAIaIQobChMIu6qQgcnm4gIVFIrICh2W_w0oEAAYASAAEgLRQPD_BwE&hvadid=274698634920&hvdev=m&hvlocphy=9007258&hvnetw=g&hvpos=1t1&hvqmt=e&hvrand=9403412165746464093&hvtargid=kwd-295261895902&hydadcr=15992_9881831&keywords=sn30&qid=1560432761&s=gateway&sr=8-4 so I got this and I also got the retro receiver. I did a firmware update for the receiver and it works well with snes classic!