Depends on your personality. PAPA is like a torture chamber. The pressure is intense and you are constantly challenged to maintain your focus despite the pressure and eventually the fatigue, both mental and physical that builds up as you approach the end of qualifying. It is physically, mentally and emotionally draining and if a pinball tournament is ever going to cause someone to break down, it will be PAPA. If you would enjoy playing golf in the US Open, you will enjoy PAPA.
Pinburgh is more likened to Pinball Boot Camp. At Pinburgh, you WILL play pinball all day (and I mean all day) for two straight days. You will play with all sorts of people on all sorts of machines with little time to prepare for new rule sets or setups. You will have to adjust on the fly and adapt to changing conditions. You will get really tired physically, but it is more of a fun environment and the mental and emotional strain are not as great. If you make it to Sunday finals, that is when the stress begins. If you would enjoy playing golf in the Bob Hope Desert Classic, you will like Pinburgh.
Personally, I will never miss either of them. They are the cream of the tournament crop and each brings a unique style of challenge and fun. I am counting the days to PAPA...