You cannot lose with either of these cuemakers for playability or quality. Gilbert cues tend to be stiffer and louder. Personal preference rules here...there isn't a better choice; both are superior playing cues.
As for resale value, both build to large followings of customers. If you are concerned about flipping the cue later, the design you choose will have more to do with resale than the maker. Both men build affordable cues that will blow most buyers away, but they also make very simple cues that may become difficult to sell in this current market. Choose a design wisely.
One of the best things about dealing with either of these makers is that they will put aside super nice wood for you...the materials will make your cue unique. Ask for it!
Omen finishes his shafts to a mirror polish. He offers the most beautiful quilted maple I have seen in the biz. He typically stabilizes his exotic woods with acryllic and then cores them. His inlay work is often CNC. Results are very precise and consistent. His finish is superb too. Lastly, he listens to his customer and gets the details right.
Andy honors the old shcool methods with his construction and designs. I don't think he does any CNC and his cues are not usually cored. He pays close attention to age and density of the materials he chooses and always builds in great playability. He has been aggressive about offering super fancy designs to elite collectors and has earned a prominant place in the high end collector's world...the funny thing is, he still insists on building affordable cues for players too.
I've bought about 8 cues from each maker and had great experiences with each, every time. Good luck with your purchase.
Omen forearms
My Avitar Gilbert