As the title says. Which one is more cost-effective?
Also, for items that are bound and fully leveled (5* stuff) is it more cost effective to make a new one with the UVs you want and re-upgrade them to 5*? or to use the UV merch?
Is it better to use the 1, 2, or 3 UV option?
Title and first question are the same. Ragecrafting for uv's is cheaper, but takes longer to get a uv. Punch is expensive, but you can get more chances for a uv you want in a shorter amount of time. You can also find subpar uv's to sell and make a small amount of profit.
You really only need one uv on a weapon, as your armour will give one of the other two and trinkets filling up the last spot. 3uv roll if you really like your chances, but the price goes up rather high.