A PT's perspective:
Knee replacements are a proceedure with great outcomes. Small chance of infection, small chance you won't have the pain relief you are after. The first 3 days sucks. A drop off in pain around 2 weeks. Back to most functional activity by 4-6 weeks, but still aching and maybe swelling some. By 10-12 weeks you should be pretty happy with it. Even better at 6 months. Even better at 1 year. Modern knees last quite a while, but it's like any mechanical part. Keep the strength around it good and limit impact where you can and it will last longer than if you go right back to what you were doing before (that wore out the knee in the first place).
Young active males tend to struggle a little more getting full extension back, so work before surgery to make sure you have good motion before the surgery. Going into surgery with full extension (to even a few degrees of hyperextension) , 130 degrees of flexion, and good quad strength will pay dividends on the rehab side post-op.
Find a surgeon that does a lot of tka's and is good with the techniques they use. Getting them lined up correctly leads to the best outcomes, regardless of whether they use a robot or not. I would lean towards a surgeon that puts an emphasis on rehab. Patients that start 2-3 days out do better than the ones that wait 2 weeks, and good strength post op correlates to good long term outcomes.
There aren't many surgeons in our area that will do a Bilateral operation anymore. They go great, or they are a train wreck, and there isn't an in-between. I've worked with tka's that were 4 weeks apart. That's pushing it and not a great idea for most people. Waiting at least 10-12 weeks between is probably best, less chance of the first one flaring up and getting inflamed when the second is done, and it'll be strong enough to handle the extra workload.
You can see I use it a lot 
