Where Should My Fur-Children Live?

Your first priority is to figure out who can and will take better care of them. Who will be willing and able to afford to get them vet care if and when they need it, who will shower them with love and attention (because they will mourn the loss of the other person no longer in their life), who will make sure they have everything they need from love and food to keeping the litter boxes clean, who will be able to spend more time with them, brush their coats, trim their nails, do all the little things they need done for them? That is the one who should have custody of them. Joint custody should not be a choice as it would be very hard on them to keep getting shuttled back and forth.

Moving cats back and forth from one home to the other can work...but not very often. If splitting the two (one for you and one for him) won't work, you better figure out who can best afford to keep them. Who will have more room, who will spend the most time with them, for example. Yes, it is hard, but try to put the cats well being ahead of your own. They deserve it.

Who pays most of the bills now for vet, food, etc? That is who should keep them. And having the cats move back and forth between places is NOT the way to go.

If one keeps both cats, then the other one can go adopt another cat if they want.