For my total knee arthroplasty procedures, I use the Smith and Nephew Legion system. I typically combine an all-polyethylene tibial component with an Oxinium femoral component. I prefer this system as it has a long track record based on registry data with excellent survivorship.
Oxinium is an oxidized zirconium that has improved wear characteristics (less debris generated with joint motion) and is biologically inert (your body does not react negatively to it). It also does not expose my patients to any cobalt, nickel, or chromium ions that may be released from other implants on the market.
Finally the survivorship of all-polyethylene tibial components has been shown to be superior to metal backed implants.