just wondering what the best knot is for tying a superline (spiderwire stealth) to a steel leader for pike and muskie

THE POLOMAR KNOT! UNQUESTIONABLY THE BEST KNOT FOR ANY SUPERLINE. DO NOT USE SNAPS W/ YOUR LEADERS, GO SPLIT RING TO SPLIT RING, GET A GOOD PAIR OF SPLIT RING PLIERS. IT IS EASY TO SWITCH BAITS THEN.
FISHFEARME

Another tip I would offer is retie after each fish. Even if the teeth never touched the line a big pike will put lots of strain on the knot so retieing is a safe bet to not loosing a nice fish. Nothing bites worse then knot failure, and it seems to always happen when we have a quality fish on.

Yep, polomar knot. Never had one come open yet.
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