I wanted to know if powder or pellets are better and which kind. I want something that will have some power in it with less cleaning. I also don't care about prices.
You can get the same effect using powder loose or pellets. I personally think you can tune a rifle better with loose powder then pellets but a lot of it would depend on how well the rifle is shooting with the pellets. If it is shooting good, why change?
You state you only have shot the rifle 10-15 times so you are not an avid shooter. Also money is not a factor to you. For that reason I would suggest you stick with what works for you, pellets.
Addressing the problem of the crud ring. Put a wire bore brush on your ramrod and wrap a patch around that. After each shot. Apply some good black powder solvent such as Rusty Duck, Butch's Bore Shine or even Windex to the patch. If all your shooting is Triple Se7en, simple tap water will work.
Work that brush and patch down the barrel in short strokes starting from the muzzle to the breech. When you reach the crud ring area, slow down and pay a little more attention with the patch in that area. The wet patch and the brush should remove the hard crud left by Triple Se7en.
If the crud ring is really bad, then you might try switching to Pyrodex Pellets. You will still get the fowling but the crud ring will not be as tuff and hard as some find using the Triple Se7en. Since you are concerned with clean up though, then stick to the Triple Se7en.....