I shoot a lot of skeet with both smokeless and blackpowder. I find they are about the same.
BLACK POWDER.
If you study the charts you find black powder is a bit slower, perhaps 1000 f/s verses 1150 f/s for smokeless.

The gun barrels will get very hot.

Many but not all types of plastic wads will melt.

Without the shot cup the pattern is a bit more open

If you use thin walled brass shells you my have to go to a larger wad.

There is a bit of latitude when loading black powder.

There is a lot of smoke and stink....I love it.

Clean up is a must. You learn to love it and really get to know your gun.

The bp subs will work but not a lot of info is availble from the manufacturer. I have always considered them smokeless by another name.

SMOKELESS

Many of the smokeess loads have lower breach pressures than BP.

Some low pressure loads are sooty especally in winter.

Smokeless load recipes MUST be followed to the letter.

From my experience there is more variation in my shooting than in the choice of black powder or smokeless, other my disagree.

Good luck and ask the board if you have questions.

RPr