long story short, compare rerolling effort for both rare and crafted version, rares take 50x times more tries if you consider luck trial roll. Also, rares take more time to roll because 1 oil is 5x times bigger than a shrine charge and it requires you to constantly put new reagents into cube (assuming no bot).
In this case, rares are in a disadvantage, and there's more, there are chances for your item to be fucked up and have less than the highest amount of sockets.
It's 100% better to roll crafts than rares.
The only exception where rare items are usable is when we talk about eth weapons. These have the potential to beat any craft, but it turns out... they are too rare.
I definetly think ethereal bows are my favorite items.