I would probably go Hel, but depends for what purpose you need the new hero. Ursena may also be an option, although I am not enjoying her so much in attack anymore as I did when I pulled her 15 months ago. For defense team, in most set ups probably Ursena is the better hero compared with Hel. she can tank and also be a good flank (i.e. to Guin). Sartana is a solid sniper with good stat distribution, of course even better with costume. Good if you may give Hel some emblems. I know Alfrike has some fans, for me she appears too slow (I do not have her). In defense no issue usually, dead before she can fire, except of course in rush. For offense, she would also be too slow for me, match already decided when she is charged or you probably already won if you brought Hel… so yeah, I would go Hel (or Ursena if you need new purple for defense).