All you'll get is honesty here
Are you wanting to compare them with the Professional series (150/200/300)-- Electric or with the Commercial FE series (100/300/500/750?) -- Pellets?
Combined your post (from the Owners forum), no one there that owns a small Electric CS will have a large SP.
Question. Are you using the SP with Gas? If so, then there is no comparison, you don't need gas assist with a CS. Are you using it logs only? Less ash with the CS.
SP's have been around a LONG time, they're good cookers and you won't do bad by them. I think a lot of people have them because they've been around so long and there wasn't competition. Now them, OH, CS, lots of choices.
They're different cookers given the two points above.
Check out the link Wheelz put for the search and read some of those see if they give you some details. No honesty like what's already in the forum.
Let us know what specific questions you have.
Russ