You really don’t need to have more than one grinder but hear me out. Sometimes having something manual vs electric seems enjoyable when you are more into the process of making a cup of coffee vs just having someone serve it to you.
Not to mention you may want something portable. I have an electric grinder I keep in the kitchen and a handheld portable grinder with my camping gear.
These are a few different grinder options I recommend and depending on your needs I am sure you’ll come away with something perfect for your coffee grinding situation.