For sculpting I use a little Wacom Intuos, as Omar has suggested. I love that the one I have is small and wireless. Makes it easy to place in front of my keyboard.
For Grease Pencil or actually sketching/inking in other programs I have a relatively inexpensive 15.5 XP-Pen display tablet. I actually “traded down” from a huge Cintiq and I like the XP-Pen much better. It’s not as nimble as the Intuos but I need to see the stylus tip on the “paper” when I’m inking. YMMV and the Intuos might be the best first all around choice.
When using a tablet it’s often easier to use the “Emulate 3-Button Mouse” option for navigation. Since I am always switching back and forth I made this little add-on that puts a checkbox on the toolbar and a hotkey combo to toggle emulation: https://drive.google.com/file/d/1F_48_Ouw414uooz1sIOzSaeSUXera2Am/view?usp=sharing
