Can only talk about the Outlaw as thats the one that I've done
The organisers put a free bus on for people who want to watch the start and then get out onto the bike course, this takes you to Southwell which is a good place to watch the bike as youn can see them twice each lap with a 5 min walk, the bus then brings you back to Holme Pierpoint for the run, this is all free.
If you position yourself well you can see people twice on each run lap (its a 3 lap run)
I have supported at IMUK as you know, I found this to be a real pain as had to park 2 miles away from the course and the locals did nothing other than moan about having not being able to drive down THEIR road.
The finish at Outlaw is next to grandstand so lots of seating and a bar, the atmosphere is always great especially next year with it being the main pirate outing.
I'm not doing it next as have done it the last 2 years (Mrs SA is again) but will be there handing out drinks etc at the pirate feed station (which IMUK doesn't have)