i have no preference either....
i bowl at Northcote (wood) on a monday nite and a tough condition is all most always put down.. i think this is great for bowlers as it provides everyone with the challenge of scoring...
i bowl at Keon Park (synthetic) on a sat. morning and i have found of late that the condition put down is getting easier but you still have to work for ur scores..
i agree with lefty in that it depends on what condition u get.. but i'd prefer to have a condition that challenges bowlers