@CaptCaveMan Yes as I say convenience is important, but I did an awful lot if research before deciding, as my collection will be #1 at either grading body, and the features available with PCGS among other factors was important to me.
Generally top coins end up with PCGS, their grades are also often accepted to be better, which is why crossovers aren't easy from NGC to PCGS, this is also why PCGS slabs tend to sell for a premium.
Don't rush the decision, but if you are only starting out I would day do whatever is easiest and cheapest for you.
Here are some crossover stats from PCGS as an example for the last 30 days: