Although I loved R-Type 2 as a kid, I never really got into the first one for some reason - it was probably because I didn’t have a pirated copy on my Amiga, whereas I did for R-Type 2. Both amazing games though, and I’m very glad R-Type Dimensions exists on Steam.
R-Type Delta is #1 R-Type for me though. Best level design, best music, best ships before it went completely nuts for Final.