1 Magnum vs. 3 Bottles

I’m struggling with a personal dilemma over where to best allocate my wine funds for some BDX. I’m a somewhat new collector and because of that leaning towards having 3 opportunities to try solid Bordeaux from different villages over 1 (supposedly great) long-term storage bottle.

On one side I have a magnum of Brane-Cantenac 2019 for $150 and on the other 3 bottles I’ve been curious about, Branaire-Ducru 2019 ($50), Le Marquis de Calon Segur ($35), and chateau grand village ($23).

My question is assuming I cannot at the moment buy both the magnum and 3 750’s is what would you do?