Which ear tip should i buy first?

Title. Basically i have never used ear tips other than the ones that came with the iem's, so i wanted to test different tips to see if the sound really changes or i can wear my iem more comfortably.

I know that there is a recommendation list here on the sub, but i don't have the money to buy and try every single one... which one shoukd i pick first? For refernce, i'm using the juzear defiant