I have never seen a ST7735B controller or datasheet. If you have a datasheet please link or PM me.I doubt if you will ever see a ST7735R. Most modules use ST7735S.I doubt if you will ever see a ST7735. The -R and -S variants have Vertical Scroll which is not available on the original ST7735.Quite honestly, it is best to choose a display for convenience rather than price.e.g. is it 5V tolerant? Most Ebay boards are not. (do NOT believe the vendors)e.g. is it on a regular shield?e.g. is it easy to wire up with level shifters etc ?David.