We are all different so KennyA suggestion to test and see which one is best for you is probably the best idea.
I was a testing fiend when first diagnosed, I tested every possible scenario. For me the best way to ensure my postprandial result was acceptable, especially if I knew my meal was a little carby. Was to have a 20 to 30min walk quite soon after finishing my meal .
I found that if I exercised some hours later it had less of an impact and could cause a slight rise, depending on how energetic I had been.