The agency I retired from was exclusively Winchester since the early 90's...during that period we had several OIS all of which resulted in the demise of the offender. Since retirement, I've found that Winchester LE ammo has been much more difficult to obtain on the civilian market than Federal and others. But, when available to me, the bonded 124 or 147 is my preference...followed by HST.
There are numerous new offerings in multiple calibers which may prove effective, but the top 3, Winchester, Federal & Speer are the brands with the most consistent "street proven" results.