For years I've oscillated between "grind my own beans" and "instant coffee" and have resisted the Kuerigs mostly because of the tremendous plastic waste -- however it now looks like there are many 100% compostable options to choose from. I'd suggest starting with some on this list: artofbarista.com/best-biode... -- perhaps the Glorybrew Variety Pack so you can determine which roast is to your liking?
My two current favorite pods are both from Starbuck’s. They are Honey and Madagascar Vanilla and Cinnamon Dolce. The honey one smells SO GOOD when it is brewing. It is a limited edition flavor, but the cinnamon is available year round.
I buy "Boyd's Good Morning Coffee - Medium Roast - Single Cup, 12 Count" on Amazon! They are in sustainable packaging and taste AMAZING! I prefer their medium roast myself, but they do offer a darker roast too!
If you don’t already have one, I totally recommend just getting a reusable cup that you can fill with any coffee you please. I like them because it still allows me to make a single serving, while being mindful of waste and the amount of space traditional pods can take up in my cabinets.