What is differene between PH43 and PH18 Fram oil filters?

I could use a part number for a good quality oil filter with a anti drain back valve, the short one. Also one for more flow and one that has more filtration. Thanks all.

I think the Ford FL1A has the anti drain back valve. I have used them plenty of times on a small block with a 90 degree adapter. I use a gray scuff pad to get the Ford logo off, and then put a Mopar Performance sticker on it....lol.