Cool down. I'm getting sort of annoyed from your attitude.
I assume you having 110 dex means you're a stalker. That's 208 attack from the dex.
Weapon number one has 50 attack, plus 30 from the standard property arrows. So 80 attack.
Weapon number two has 120 attack, plus 30 from the standard property arrows, so 150 attack.
50 attack, three slots
Base attack: 208+50+30 = 288
Three Hydras = 160% of 288 = 460,8
Two Hydras, one Skel Worker = 115% of 140% of 293 (5 attack added from the card) = 115% of 410,2 = 471,73
So your best bet with the 50 attack one would be Hydra, Hydra, Skel Worker, with a modified attack value of 471,73.
120 attack, two slots
Base attack = 208+120+30 = 358
Two Hydras = 140% of 358 = 501,2
One Hydra, one Skel Worker = 115% of 120% of 358 = 494, 04
Your choice with the 120 attack one would be Hydra times two.
Three slots, 50 attack, 110 dex: 471,73 modified attack value against medium demi-humans. (Hydra, Hydra, Skel Worker)
Two slots, 120 attack, 110 dex: 501,2 modified attack value against demi-humans. (Hydra, Hydra)
If I were you, I'd go for more dex and the three slot one, but eh, it's your choice. For your dex, the two slot weapon's better.