I did some experimenting in the shop with Stan’s, Orange and Muc-off. We drilled holes and used a knife on the tire to synthesise a flat.
Stan’s filled holes, not slashes
Muc-Off sealed the biggest holes and slashes, but you needed A LOT of it to cover the inside of the tire.
Orange Seal sealed all holes like Muc-Off, and some slashes, but didn’t need as much.
I run Orange Sealant after this, (then I’d use Muc-Off, then I’d go for Stan’s)