Now this is interesting...
Have you played a comparable number of racks of each?
Here's my guess, 8 ball is easier for intermediate level players to run out at, especially experienced players that can pick out an easy pattern and avoid having to shoot more difficult shots. In 8 Ball these players can hide their cueing deficiencies a little easier. Whereas, in 9 Ball you have to be able to pocket those more difficult shots in order to get out, or even play difficult positional shots at times.
I think the better you get the more that 9 ball run out number will increase and maybe even surpass the 8 ball run out number. Although at some point, it all becomes about how well you break.
348 - 8 ball matches
217- 9 ball matches
i think there are a couple of factors involved.
1. like i said i am a notorious slow starter. we have a 1 1/2 hour free table time before matches start. due to my g/f ALLWAYS has something to do before we leave i never get to the pool hall until about 10 minutes before matches start. therefore i never get to warm up... just get up and start playing my match.
2. in 8 ball if i make something on the break i usaually have something to shoot at to continue the inning. by the time i get a couple of racks under my belt i have a good shot at getting a break and run.
3. in 9 ball i guess i break awful. cant tell you how many times if i make 1 on the break i have no shot to continue the inning.
4. as you know apa 9 ball is points based. i cant tell you how many times i finally get in stroke and am on a sure break and run and i hear GAME OVER !.
you would just not believe how slow i start off sometimes.
one night playing a pretty good 4 and i get down 18-2 before i start getting in stoke. after i won the match my captain said... i never would have believed it if i had not seen it. i said seen what ? he said you were down 18-2 and come back and won 38-24. he said you scored 36- to his 6 after the 1st 2 racks.
i was down 23-7 against a 5 and come back and won 38-35. not every nights like that though.
i had a 1 put me out of a qualifying board last month. would you believe she beat me 14-22 ? i had a bad night that time.