Best: for me is least expensive to keep shipping cost down for buyer.
I’m not selling collectibles, so I can keep it simple, and keep shipping costs down, nothing fancy: lp in it’s sleeve, in a box. watch your unit price, look out for excess shipping costs
here’s .60c each, free delivery (add tax).
They fold, either 1/2" or 1". Typically: just 1/2/3 lps Inside: I use usps priority mail stiff envelopes tripled over. like a spring, to take up the extra inside height, cushion the lp/lps if only a few. fed ex letter envelopes the same, any stiff cardboard that can be rolled to be like a spring.
Recently I sent 100 to one nephew, 50 to the other. You can fit 8-10 lps in the 1" height, tape em tight, they all arrived safely.
If BEST means best method/protection for collectibles, that’s a whole different category of box.
I buy albums from Amazon, and the boxes they use are very protective (new lp with lp in the sleeve), I save the boxes. Others, remove the vinyl from the sleeve, add new static free liners, ...