They are both excellent choices, I prefer the Nikon for me its clearer at long range. Some like lines some like circles for me I like to see what I am shooting at especially with a small target at long range. The better ones for muzzleloaders have long eye relief so that with heavy loads at long range you don't get scope eye. if you never shoot heavy loads or long range you can get along with a cheap scope and don't need one like this any way.I know there are a lot of people that use loads like I taught my kids to shoot with and never put a good long range load in their gun.
Actually there are people who do most of there shooting at 20 to 50 yards and that's fine but they really don't need a good scope or a decent load for that range even if they prefer them. A lot of your scope needs depend on what you intend to do with it .