I used them both on our last boat
. I much preferred the Bristol, it gives a super smooth finish and since you can apply wet on wet it goes on very fast. Lasted much better than Cetol gloss did, looked far better after 3 years and no sign of any lifting or peeling. This was on teak
rails on the cabin
top, the teak cockpit
table done with Cetol looked dull after 3 years and that was out of the sun under a bimini
. Even though it's a lot more money
the results are worth it, IMHO. I stripped everything to raw wood with chemical stripper and lightly sanded the raised grain before applying finish.