Unless you're running suicides imo omega not worth it.
Having both as 5/65 max sig, they both have their uses for me and personally won't be selling Namor.I tend to favor suicide masteries too which both excel with. Well, Namor less now with his regen being cut down.I generally use Namor in AQ map 6 for a lot of the painful degen nodes and paths.I generally use Omega Red in AW on Path 2.Both are stellar champs, and if I had to pick only 1 I would have a hard time with that decision. They both have *similar uses* but they both have their own niche where they excel.Namor Pros:Damage reflect, damage mitigate - so if you have some passive debuff or unavoidable debuff, or the defender has some form of thorns-interaction, he throws that damage back at them mitigating 100% of the damage he would have taken. More damage = Faster fight = Less chances for a mistake.Omega Pros:Poison immune. Mostly bleed immune. 1 point in coagulate will mitigate all bleed damage. No thorns damage on medium attacks, which means for the same matchups as namor would take longer since you are sticking to only mediums and heavies, unless running suicides and have sabertooth on your synergy roster to stack these spores quickly, then Omega probably would drop that same defender a little faster than Namor in most scenarios, in less hits too (meaning less power for the defender to activate their special attacks)I could see the decision swayed either way. I guess ultimately it depends on what you need and the content you're focused on. Eventually you would likely stand to benefit from having both champs ranked and maxed.