Probably the best pizza-by-the-slice in Toronto, and one of (if not THE) largest too!
Even though pizza is ubiquitous, I'll hop on the subway for a slice of arrabiata (mushroom, garlic, and fresh jalapeno) from King Slice.
I'm a big sauce guy when it comes to pizza, and this place can go up against any pizza-by-the-slice sauce I've ever had. It's not Terroni or Libretto, but it's as good as pizza sauce gets in the $5 range. Fresh. Same with the ingredients on the arrabiata (the only slice I've ever tried), which are well matched.
There are only four choices of slice: cheese, pepperoni, arrabiata, and deluxe, but it really shouldn't matter because the crust and sauce stand up on their own. I suspect that having only four choices is one of their *secrets* to keeping the slices always tasting fresh. That's the only rational explanation I can come up with. Maybe they use magic fairy dust in their crust. I've been in for a slice 2 minutes before closing. Cringe now; that's never the right time to go for a stale, reheated slice. Am I right? Not in this case. For all I knew, my reheated slice had been baked five minutes earlier.
Go for the garlic oil on the crust. There's nothing outstanding about it, but it doesn't hurt, and you won't be holding this slice by the crust anyway. It's too big.
My only reservation about King Slice is that I wonder if the peppers they're using now are less hot than they were a few years ago. I remember having a lot more difficulty eating them when I first discovered this place.
Take it from a guy who will travel 40+ minutes (by subway) for an excellent slice: King Slice is well worth the trip.