Which 4* should I favorite for shards next?

Hey all! I'm a try to champ everyone player, but I might as well focus on the best characters first. That being said, here are my options for favorites listed below with covers and shards listed (let me know if there are any questions):

Abomination 2/5/1 (775) [10 total covers]
Annhilus 1/1/1 (1800) [7 total covers]
Black Knight 2/0/1 (775) [5 total covers]
Cosmo 1/2/3 (815) [8 total covers]
Doctor Bong 3/0/5 (1775) [12 total covers]
Doop 4/1/1 (725) [7 total covers]
Echo 4/1/3 (1350) [11 total covers]
Gertrude Y. 0/1/2 (740) [4 total covers]
Hellcat 3/2/3 (1100) [10 total covers]
Hulkling 4/1/2 (1525) [10 total covers]
HT (Jim Ham.) 1/1/5 (1525) [10total covers]
Ikaris 4/2/0 (720) [7 total covers]
Karolina Dean 1/2/3 (140) [6 total covers]
Kate Pryde 2/0/3 (960) [7 total covers]
Lizard 3/2/2 (0) [7 total covers]
Loki 2/1/0 (800) [5 total covers]
MODOK 3/3/3 (150) [9 total covers]
Maria Hill 3/4/3 (726) [11 total covers]
Monica R. 3/2/2 (1190) [9 total covers]
Namora 1/1/1 (0) [3total covers]
Peni Parker 2/2/4 (1125) [10 total covers]
Reptil 2/0/1 (490) [4 total covers]
Rhino 1/1/4 (540) [7 total covers]
She-Hulk 5/2/0 (1075) [9 total covers]
Spider-Ham 3/1/2 (1160) [11 total covers]- not sure I can fave
Spider-Man (Os) 2/1/4 (515) [8 total covers]
Taskmaster 3/3/1 (75) [7 total covers]- not sure I can fave
Hyrdra Stomper 2/1/4 (1290) [10 total covers]
Wolfsbane 4/1/4 (1423) [12 total covers]

Which 4* should I favorite for shards next? 0 votes

M'Baku (4/2/1) [0 shards]
0%
Doc Ock (3/3/3) [725 shards]
0%
Northstar (2/5/3) [600 shards]
0%
Other character listed (who?)
0%
Other opinion (explain)
0%