Get the 50. Way more options for it. I was on the fence between 45 and 50 when I first got a muzzleloader. I got a 50 and glad I did. You can develop a heavy load for big critters and a lighter one for the range and deer.
Frankford Arsenal is very hit or miss. I had the Intellidropper for a while before it broke and got my money out of it. When it broke I got the Hornady and it is also good. I have tried their universal die during Covid and everything else was out of stock and it was junk.
The Hornady COL gauge...