Both have utility.  Get both eventually.  But try to get one or the other first if you can only get max frags on one or the other each cycle.  Then save the fragments and don't open them until a champ chase or cvc event..  

i have trained Yannica buy not equipped, Yakarl is still in frags.

Btw, I presume you need 100 pieces of each to summon them? And by the 0/5 I presume you can only buy 5 pieces a week - or is that the number of times you can buy that champion? Apologies if daft questions, but I don't see any explanation in the shop!

100 fragments, 5 per week

Thank you. :)

Looking at this again, are both bery much arena champs? Or.does either have a particular PvE focus?  Yannica would be quicker and easier to get, but Yakarl sounds really cool. Literally. :)

Yakarl may have some value in DTH as an AoE CC'er. 4-turn cooldown makes it harder to work with, but you can get around that with Reflex gear, and the part about it being conditionally not resistable could give him added value.

Yannica may have some value in CB and Hydra, depending on your teams, due to her A1 leech and constant perfect veil.

Whether they have value for *you*, will be a question only you can answer.

I've not opened doom tower or hydra yet, so am not entirely sure what I need. DT will be opening very soon though as am lvl 39. :)