The top drawer of the freezer looks like this:
Butter on the left is 'everyday' butter (£10.80/kg), butter on the right is 'cooking' butter (£7.96/kg) ! Both, ALWAYS unsalted. Because you can always add seasoning to personal taste.
IMO, Président is the best commercial butter available.
Lescure is also very good, more expensive, £14.80/kg. Kerrygold is £9.60/kg.
Some professional chefs swear by Echire.
Have eaten it a few times and it is delicious. To my uneducated palate, however, it is not worth the extra over Président. About £ 25/kg !!! (available in US @ $11.00/8.8 oz)