You have to get “stable brick” if you want real bricks in an aisle. Different firing process and mixture of stuff in the brick than what common bricks are made of. Not inexpensive, but certainly works very well under horses hooves, shod or barefoot. This is what they used in the “old days” for the expensive barn’s floors. No chipping, sweating, very grippy with their rough surfaces in any weather, wetness.
The rubber pavers do make excellent flooring in aisles, don’t get slippery under the horses, even here in Michigan. Also pricy, but sure nice stuff! Not sure how they hold up under machinery like tractors and spreaders. Probably depends on how well the under layers are put in, to keep the rubber pavers stabilized with weight on them.
I would NOT suggest any of the cement with pressed designs, either brick or stone looking as aisles. They DO get slippery in humidity, pulling moisture into the cement from the air, appearing sweaty wet. Also bad slipping with melting snow or wet hooves walking on them. Barefoot horses do slip and fall, I know one horse who never got to be used after slipping and falling at a young age on the fancy pressed cement. Even shod horses need to be careful unless shoes have traction devices on them.
Two of the barns with those pressed cement floors got the special barn vacuums to keep them cleaned, quite expensive. They had all the fancy stuff, didn’t want the leaf blowers spreading dust onto chandeliers, fancy brass stuff of stalls. So keeping the floors clean was work to get those loose pieces of straw and hay up, broom was not doing it well enough to suit the head Grooms.
I would go for the rubber pavers if I could afford it, lovely things under horse hooves.