The kind where their legs are resting on your shoulders and wrapped around your neck. What would it be like? Who would you carry?

Hm...

Starlight Glimmer.

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I would carry Celestia!

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I would hoist Twilight Sparkle up and over one of my shoulders, point to the crowd and say: "Screw all of you! I'm going to go bang my hot pony wife!"

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Luna, Rainbow Dash, Fluttershy and Octavia.

Octavia!

*Looks between Maud and Limestone Pie*

"Now, who wants to go first?"

Wouldn't Luna be heavier and Fluttershys mane dangle in your face? I know that when Fluttershy is hovering, her mane dangles over her belly.

I would carry the main 6 luna and Celestia

But first applejack and rainbow dash and twilight

So much to chose... Derpy I guess?

Luna of course

My Luna or the OC in my avatar.

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wouldnt she break your back she aint small by any means.
cake not withstanding

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Of course, you are right in your reasoning. But my answer to the question on this topic had a deeper meaning.

And the whole point is that my attempt to do such actions with Celestia would lead to funny consequences. I wouldn't be able to lift her, and I would end up pinned down by her body in an intimate position. If you know what I'm talking about. But my bold attempt will bring me a win.

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"Screw all of you! I'm going to go bang my hot pony wife!"

more like
"Screw all of you! I'm going to go bang my hot pony Waifu !"

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What about Luna?

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To be honest, I would not refuse my attention to any mare.

But as I once wrote in my story: "If I start dividing my heart like a cake, then Celestia will get the biggest piece."

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I meant like, would Luna be lighter than Celestia?

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Heh... It would be logical if Luna would be lighter than her older sister. The Canon showed us that, and I wouldn't want to think otherwise.