Try TiteBond III, it's waterproof. Most other plain generic yellow
glues won't be--at least not after significant wetting and moisture.
Since you are going to use it as a bar top (i.e. spilled drinks, water
rings from glasses, etc), having the glue joint dissolve or weaken due
to moisture exposure would be bad.

Just my opinion....

I wish to make a board eight feet long and 16" wide. I shall use purchased
red oak from HD or Lowe's. I believe this comes in boards or planks up to 8"
wide. I shall use biscuits for the jointing and various clamps. After
jointing and sanding the board will be stained and clear coated, probably
with urethane.

Which glue is best for this jointing project? PVA, urethane, catalyzed
epoxy, etc? I want the board to be strong as it will be used for a small
domestic bar top.

Many thanks,

Peter.