Can you please tell me which is the top brace for a sprained ankle?

Depends...: Get checked by the doc before guessing. There are different degrees and types of ankle sprains...Sometimes the off-the-shelf devices aren't enough and a prescription device may be needed.

There are many: Air cast makes a good one. My protocol is place you in pneumatic cam walker.

Tie-up gauntlet type: The best ankle braces for ankle sprains are the ones that help stabilize and control swelling. The tie-up gauntlet designed types (lots of brand names, but essentially same function) wrap around the ankle and tie-up nice and firm to control stability of the ligaments and help decrease swelling. Hope this helps.

Depends on severity: It depends on type and severity of the injury. Have it evaluated and have the appropriate brace prescribed that best suits your condition.