For the average house bowler? I think that ALL the patterns are equal as far as playability and difficulty goes. Ok, maybe the chameleon could be a little tougher. As tdub36tjt mentioned, a deep inside line might be outta the average league bowlers realm.
Listen, Ive bowled on them all and, in all honesty, have never found them to be THAT difficult.......until the patterns get blown out and carried down. Thats when the cursing and head scratchin starts. lol! Ive never bowled on a pba pattern in a 3 game league setting. Always been at least 5 and its ALWAYS late in the 3rd game when i gotta start making major adjustments.
I would think that the average 3 game/night league bowler could handle any one of those shots. Give them a few weeks to get used to it and let em go. Of course, pba or walled up house shot, ya gotta have SOME kind of consistency with your speed and accuracy. Spares on either type of shot are equally important as well.
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FOS