If you need to beat a content that requires Doom or Claire, then go for Duals. If you want them, go for duals, if and only if, you have built yourself a balanced roster. If not, go for basics and build your roster first.
Basic >>>> dual.. That's my experience.. I have opened like 30+ science mystic crystal.. The best champ I remember getting was ghulk.. And all the others were pure ***** and now I have so many science and mystic iso that are completely useless.. So to rank up other classes champs you will need more gold
if you are hunting for champs belonging to a specific class and you are not looking for anything in particular from the other classes, then go for the dual crystals. If you are equally keen in a specific champ from every class, then regular 5* .
Buy the basic. You’re roughly 2/50 on getting Doom/Claire but there are so many champions that aren’t science/mystic that you’re still lacking unless you have like 100 untouched 5* off screen. The dual crystal is aimed more for people who are missing a couple of pieces of the puzzle to complete their 5* rosters. You’re only just putting the outside edge together at the moment.
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If you need to beat a content that requires Doom or Claire, then go for Duals. If you want them, go for duals, if and only if, you have built yourself a balanced roster. If not, go for basics and build your roster first.
For me science/mystic is the best crystal for percentage of good champs. A lot of the dupes are good results.
The dual crystal is aimed more for people who are missing a couple of pieces of the puzzle to complete their 5* rosters. You’re only just putting the outside edge together at the moment.