Centerpiece height advice?

I personally would choose either 2 or 2.5 feet centerpieces. But that's because I am not a huge fan of really tall centerpieces, I feel like they get in the way.

2 foot with the arrangement on top would be right at my sight line to see across the table, so I'd always opt for higher, just so your guests aren't having to look around your centerpieces to talk to each other

My wedding is in an Atrium with a glass ceiling that is about 15 stories tall, and we are doing 36" vases for about half the tables, and low centerpieces with tall thin candles as well for the other half. We found that the height of 36" felt right with both the tall ceiling and being able to see other guests through the glass

2 ft. honestly i am personally not a fan of really tall centerpieces because i think it kind of makes it harder to socialize across the table, etc. so i would definitely go for shorter

Upon recommendation of my floral designer, we did a mixture of high and low (on the table) for my venue that had 21' ceilings. The different levels grounded things, so to speak. You could additionally add uplighting to connect the low and high, but also to create a feeling of enclosure.

I am not a fan of tall center piecies it limits conversations with the other guests who are at your table, If you have to do tall I suggest you use the 2 vase