Alec, the superior unit? Lol.
Noish is 10* the better father, and arguably the best father for Ayra's kids, and the 2nd best father for Brigid's kids, which automatically makes him worth using. Both of them need one thing to become great combat units.
Alec needs the Hero Sword, which means taking it away from Ayra, and that's not going to happen. Even Noish makes arguably better use of the Hero Sword than Alec does, as well as Lachesis on promotion.
Noish needs the Pursuit Ring, which means taking it away from...uh...Levin? Once he gets Holsety, he doesn't need it, and the only other characters who might are Jamka(Hero Bow, Killer Bow, Continue/Charge...no, he doesn't need it) and Tiltyu(lol).
There is MUCH less competition for the Pursuit Ring than there is for the Hero Sword, which means Noish is more likely to not suck. Without their respective items, they both suck, so it doesn't really matter.