We have 3 (well,2, option #3 is a bit "out there") options for venting our gas clothes dryer. Can anyone please advise which may be the best one?

1. Go out the back of the dryer, a 90-degree turn straight up 8' through the roof.

2. Out of the back, a 90-dgeree turn up 4',another 90- degree turn, then a 9' horizontal run to go through an outside wall.

3. Go out the back,a 45-degree turn down to the floor (run of about 4'), then 4 45-degree turns, along a 14' horizontal run out to the outside wall.

The question basically is, will the venting work better to come out of the dryer at 90-degrees and go up 8', or is it better to not vent vertically and go mostly horizontally even with a bunch of turns in the ducting?

Our contractor is an idiot (sorry, it's me who is "venting" now...) :(