The best replacement for mechanical valve is tissue valve.

The best alternatives to mechanical valve are rated as following:
★★★★★  tissue valve
★★  biological valve
★★  pig valve
★  bioprosthetic
★  animal valve
★  porcine
★  prosthetic valve
  split septum
  bovine valve
  pigs valve
  tissue

Your alternative for mechanical valve is not listed? Suggest!
Speaking about mechanical valve, one probably shouldn't forget about anticoagulation.

Other search terms related to mechanical valve and their ratings are:
★★★★★ anticoagulation
You have in mind a companion for mechanical valve and it is not yet here? Propose!



Google Trends

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mechanical valve
tissue valve
biological valve