OK - well it seems to be based on you not wanting to go to Leigh. Which is fair enough.
Apart from earning more 2015 funding, I'd say fourth is better.
Week 1 - Leigh a - Win
Week 2 - Much needed week off
Week 3 - Home to whoever beats Leigh in Week 2
Week 4 - Final
In the unlikely event of Leigh actually winning in Week 1,

we're certainly no worse off from a playing point of view than we would've been in fifth place. We'll be at home (which is a debatable advantage - but we have to play a home game somewhere in the mix) and we'll have an opponent from places 5-8, instead of 1-4.