I also agree with Bones. We have a guy on our team who avg. 196 last year, would shoot 720 one night, then back it up with 3 straight 550's. Unless everybody else is bowling good when he shoots 550, we lose a lot of points that night and dont fare well.
As far as which would I choose, last year I avg 203 with a 300 and several 700's (no 800 though). If going into a lot of high handicap tourney's (like 90% or 210/220), I would take the low avg. If scratch, then it doesnt matter if you avg 220 or 120, its scratch. Personally, I would take the 205 with a 300/800 night. For me that means I had one or 2 extremely good nights, a couple not so good nights, but for the most part shot right around 600-620 for a set. I always try to shoot good, never give up type of attitude, even if it is a grind (carrydown, lack of oil, bad carry). Give me the jewelry, I am still avg 200+.
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The only thing good about 2 lane courtesy is more time to drink beer...