I was going to install my coilovers first but hasn't ended up this way
My rims are getting fitted next weekend so i'll be putting coilovers in after that
I think if you have bigger than factory rims like i do then install them first and get them to clear everything as coilovers will be smaller than factory struts anyway so doesn't really matter
I don't think that it really matters. If you are going to have clearance problems, they're going to be there no matter which one to do first. Just find and correct the problems as the come, and everything will work out.