I tried pellets a few times. Issue is that once they're implanted, you're stuck with the dose until they metabolize - typically 4 to 6 months. All pellets managed to do [for me] is spike testosterone, of which the excess aromatased to E2 and spiked that. I felt like sxit on pellets. With the excess E2, my libido tanked. They might as well have neutered me.
Switched to T-cyp injections. Now I can control the dose and dial it in to exactly what my body needs. Once dialed in, I feel -FAR- better. Libido is good and I'm able to keep the wifey all happy, happy. ;-)
To each their own - for some, pellets work...for others [such as me], not so much.