Had Sealion been launched, what German units do you think would be used? and Why?

I agree with you on this also. I have seen photos of some of the hodge-podge "landingcraft" that the Germans would have had to ues in Op Seelion.

The Germans altered a few ships to have landing ramps installed in the Bow os some ships, by cutting a portion of the Bow off, and making a ramp, just like castles had.

In photos I have seen were also some so-called landingcraft, that had Luftwaffe Fighter and Bomber engines mounted onto flatboats, and had the propellers on them for the "push" they would have needed.

Not as a what if, look below.

The R.A.F. would have slaughtered the Germans in the channel, even if the Luftwaffe mostly controlled the skies.