You may thinking this is a no-brainer because the Elite 75t are the newer model. It is hard to argue with longer battery life, a smaller size for better comfort, improved sound, a nicer case, and USB-C for charging, but the Elite 65t still hold their ground.

From the start, Jabra did right by the Elite 75t by shaving down the form factor by about 20% to make them much easier to wear for more types of ears. The Elite 65t weren’t as reliable that way, as the earbud could sometimes wiggle loose and fail to maintain a proper seal for the ears.
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https://www.androidcentral.com/jabra-elite-75t-vs-65t