If you're new to machine polishing I would recommend getting either LC or BS 5.5" foam pads and a 5" backing plate to use with them.
Foam offers more cushion that microfiber and in my opinion there's a shorting learning curve to learning how to machine polish when using foam as compared to microfiber.
People forget (I don't) but the Meguiar's Microfiber DA Correction System, the system that started it all, originally came out as an alternative system to replace the use of rotary buffers in the production detailing industry.
Foam is more forgiving than fiber pads. The feeling of buffing with foam is smoother than buffing with microfiber pads, at least the thin MF pads.
So again, if you're new to machine buffing I would get foam pads and later add microfiber pads.
I think I make this recommendation in my how-to book The Complete Guide to a Show Cr Shine too.
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