Honestly - either one as long as you make sure you keep your endurance up and know how to pace yourself. If you are riding to win it/vs just finish with a good time will be a big part of the equation.
To be clear - the quoted part was written by someone else on reddit/r/velo a couple of years back and I cannot locate the authors name - but it is really good advice. I would mix it up and put several of the climbs sprinkled throughout your training ride - if your training area allows for such a plan.
I am no climber by any stretch by after having done it twice now my TSS for the ride was 288 last year and 266 in 2016.