You may have noticed that your thread just got moved to NEPRT. (Never Ending Pointless or Recurring Threads)
Not to say it is a bad question but just that it has been asked (and answered) many times. Do a little searching...
Personally, I am partial to the Dunlop Roadsmart 3. Well behaved, decent wear pattern and lifetime. Generally well priced and Dunlop often runs a rebate program on these. There is a new Roadsmart 4 but more expensive - I haven't tried them yet.
Bridgestone, T31 or T32, Michelin PR4 or Road 5, Pirelli Angel GT II etc. All of these brands have decent reputations. Lots of others out there including Shinko, Continental, Metzeler etc. and most have been used on the FJR. None would be considered a high-mileage champion over all the others. Michelin and Pirelli are among the higher priced options...
Look for a tire designated for sport-touring. The FJR is a heavy beast and tires made for a light sport bike won't last. Most people find that tires made for a heavy cruiser are not especially compliant and while they may last longer, they won't offer the grip you might want - even if you don't ride aggressively.
Huge thread (with summary) on here about using car tire on the rear for the ultimate in longevity. aka "Darkside"
https://www.fjrforum.com/threads/going-to-the-dark-side.141913/If you decide to give it a try, at least wait until you have run a few sets of motorcycle tires. I ran a couple of car tires for around 100,000 km total but ultimately decided to go back to MC tires.
See what your local places have and for what price. Compare to on-line guys like Pete's Superbike
https://www.petes-superbike.com/index.phpor dropship to a US address from one of the big US retailers. (I see you are in Windsor). Most do free shipping to a US address and prices (even with exchange) tend to be lower than in Canada. Pete's probably has best price and selection in Canada although check Fortnine and your local guys - never hurts to ask for a price match.