Grinder lvl.2 - as you say, it is not only the speed of deconstruction (grinding), but more importantly the scope of items you can grind... with lvl.2, you can grind most things except the "big structures" ie. buildings (except those that you built, those you still can scrap)... Personally, i can recommend to do drilling only for type of ressources/items you are not getting by grinding, otherwise grinding is faster/easier... but if you not getting say enough glass plates, you drill some silicon and 3Dprint some of those...
