I wish dunlop still made 15's.
I ran BFG's back in the day and run coopers now.
the bfg's were always bad in rain, and from what I hear are not any better today.
you might look into the pricing at sam's club. you can get a 20 dollar membership from govx and they generally run a vet discount for memberships as well with 20 bucks off your first purchase.
they also sell both, and give money back on bfg's too if you are going to go that route.
my current set of cobra's are about due up for replacement too.
like you mileage isn't what is going to get them, so the warranty isn't a big deal.
sam's includes the road hazzard as part of the install. which on some sale days is included for free.