is a mystic salvage kit as good as a bl kit
Doesn’t look like it. http://wiki.guildwars2.com/wiki/Salvage_Kit
From what I can tell, black lion salvage kits are better for getting dark matter. As long as you have them, use those first.
The biggest difference to me is for runes and sigils. If I want a rune or sigil off an item I always use a black lion salvage kit, because there’s a 20% chance with a mystic salvage kit that you won’t get it.
For dark matter, I might get a bit more dark matter with a black lion salvage kit…it seems like it to me, but I don’t have enough of a data set to really make the claim.
http://wiki.guildwars2.com/wiki/Mystic_salvage_kit : 25% chance of rarer materials. 80% chance of recovering upgrades from items
http://wiki.guildwars2.com/wiki/Black_Lion_Salvage_Kit: 50% chance to get rarer materials. 100% chance of recovering upgrades.
So no.
I’ve never seen a definitive answer but anecdotally I can say that I started off with mystic kits and when I switched to BLSK, I saw a definite uptick in the number of dark matter I got.