Thunderwolves need loads of dakka with little or no
ap because of their storm shields (so poison or shredders), while regular marines are vulnerable to weapons with
ap modifiers (so blasters). I'd say it depends on how your opponent usually deploys his strike squad; in cover y/n.
If you want to use scourges as a generalist answer to both these problems then I'd recommend shardcarbines. They're effective against both targets. Bring plenty though, you need 3 shardcarbine scourges to do a single wound on a 3+ save on average.
some numbers:
TL;DR: Use carbine Scourges and use the saved points on more dakka. Blasters are nice to have in general, but don't work on thunderwolves.