Depends on your brewing preference: Keurig/etc, drip coffee, french press/cold brew/etc etc.
For Keurig, we drink the Victor Allen's medium roast because we can get it for $0.25/cup at Woodman's (Wisconsin grocery store)
We don't drink drip coffee anymore since we have a keurig, but I put this as an option because this opens you up to the wide selection of pre-ground coffee. We like to sample a variety, but we steer clear of Foldgers/Maxwell. I actually have an Aero Press
, which brews much better hot coffee than drip or keurig IMO.
For French Press / Cold Brewed / Espresso / etc, you're now looking at the whole bean coffee because those types of brewing require coarser or finer grind respectively than your typical keurig/drip coffee. That gives you two options, most grocery stores have grinders in the coffee aisle for customers to grind the local roasted stuff (fill your own bag), and/or you can buy your own grinder if you prefer to buy pre-bagged whole bean stuff or not use the store grinder (I'm not sure how often those things get cleaned).
And yes, my experience has been that the locally roasted coffee beans are better tasting than pre-bagged whole bean which is better tasting than pre-ground.
Also, light or medium roast coffee tends to be less bitter so it's a bit easier to drink black.
There are many brewing styles. As I mentioned, my wife and my current options are Keurig, Aero Press, French Press, Cold Brew. All have their pros and cons in terms of brew/prep time and flavor. You can also get into nuances like water filtering, various grinders (burr vs blade), etc etc etc. The list goes on. My wife primarily drinks Keurig, but she's usually looking for something quick before she leaves for work in the morning. I like the Aero Press and Cold Brew. I only like hot coffee in the morning, after that I like iced/cold brew. Cold brew is my morning preference because it's ready to go, and I'll do Aero press on the weekends or if I have 10 extra minutes in the morning.
Main: i5-3570K, ASRock Z77 Pro4-M, MSI RX480 8G, 500GB Crucial BX100, 2 TB Samsung EcoGreen F4, 16GB 1600MHz G.Skill @1.25V, EVGA 550-G2, Silverstone PS07B
HTPC: A8-5600K, MSI FM2-A75IA-E53, 4TB Seagate SSHD, 8GB 1866MHz G.Skill, Crosley D-25 Case Mod