I've been on this site too long because I was wondering when this question was going to pop-up again for the 2019 show season!
I probably have a different approach to gear vs most other people in that I don't really care if I get the best price possible. I bought my jacket back in 2004 and am still happy with it to this day. If you're buying quality gear it lasts forever, so I'd recommend paying more attention to the fit (does it have a little extra room for the lbs that 99% of us are destined to put on?). Is it a trendy style/flashy style that won't age well? Is it the same colour as your bike? (if it is then by all means worry about the cost because it probably won't match your next bike!) Same for me and helmets. I buy a helmet that fits well, is super comfortable and is almost always grey so it doesn't look weird on any bike. I could care less if it has the latest aerodynamics, I ride on the road, not at Donington Park. I don't care if it is bluetooth compatible or has a place to mount my camera. I'm going to keep it at least 5yrs too, so over the life of the gear, saving a few bucks doesn't matter as much as making sure its the "right" gear.
Also, I like being able to try gear on so I'd say buy from GP over F9 even if the price isn't as good (as long as it's close) and keep a bricks and mortar open. Otherwise you'll have to order everything just to try it on and find out you don't like it.