Ted, do you have a locally run minilab near where you are? If it's a one shop business or one relying solely on photog business as opposed to a multi-chain gaining 99.99% of its profits from food then it has to be good to survive. Unless you local supermarket has well trained and diligent operators then I'd try and find a local minilab even if it means a short car journey.
Alternatively you can only try as many supermarkets as exist in your immediate area with non critical film and compare the results.
If you ever decide to enlarge for other than the occasional print only then I'd seriously consider doing it yourself. The prices rise very rapidly for print sizes above 6x4.
Please don't read this as a challenge, I'm not qualified to make one, but why are all motion picture negatives processed on roller transport machines with far more paths than any stills roller transport machine utilises? With all respect to folks' rolls of stills, a 400ft roll of motion picture negative which may record an investment of many thousands of Dollars or Pounds resulting from the cost of what was in front of the lens may be a far greater risk to take if scratching is a risk?
Motion picture labs do, of course, run scratch and sensitometry tests daily, but the few minilabs where I have worked do so as well.