I've got some resources about to expire, so I need to rank up a 5* Science champ from rank 3 to 4. I've already got a pretty good roster, so none of them will make my usual line-up, but which one would people recommend to rank up for future use?
The choices are Wasp, Void or Luke Cage. All three are awakened at Sig Level 20. (See below for my selected champs, and normal roster)


Thanks.