I've owned both, and I agree, if you're looking at a long term keeper the no-brainer is to keep buzzy and let someone else enjoy Esprit ownership.
Loved the Esprit, and mine was a mere 12 to 15 years old during my tenure of ownership, and I kept it in immaculate running condition.
If long term ownership means keeping it in the garage, just doing the odd weekend drive and local car shows and cruise-ins, maybe the Esprit.
But if you actually want to use the car on anything like a regular basis (not DD, but still accumulating some miles) then it's no competition. The expense of maintaining the Esprit, and the growing scarcity of some parts, means that if you're going to drive the car to the point things wear out and need replacing, the Esprit will drive you into the ground.
I used my car fairly often, putting about 40K miles on it in just over 3 years. I set aside basically one weekend a month to completely go over it trying to head off problems before they arose, and even then, issues would pop up. Some of them quite pricey. I could not have afforded to own the car if I had to pay anyone to do the basic maintenance of oil/fluids, brakes, shocks, and the ever present odd electrical glitch.
If you're going to actually use the car over that 'long term,' Buzzy would be my keeper. Buzzy IS my keeper.
Where I live, I know of a couple dozen Esprits sitting in peoples' garages...ranging from G-bodied to late V8's. For the most part, they are garage queens. Some because people simply are afraid to get them dirty, others don't feel like racking up the miles and doing the maintenance. The cars only show up at meets, and even then not so often. There's the rare one that tracks the car, but he's the exception, not the rule.