I love to write but I'm not as adept a speaker. And I'm a visual / kinesthetic learner, which means that I remember what I see or do far better than what I hear. This explains why writing is an easier way for me to communicate, since it involves both vision and touch. What I hear I do not retain, and I cannot "think on my feet" and process information only in my head as during a speech.
I recently caught myself saying to someone "I see what you mean" and laughed at myself: unless there's a large cartoon balloon over their head, obviously I cannot literally SEE what they mean! But my words represent how my brain works (uh-oh, that could be dangerous!).
You can improve your own communications with friends, family, and clients by really listening - do you hear a client use words that indicate they learn by listening? Or does your spouse often start sentences with "see"? Then use those words yourself as you speak or write to them - this helps flip their brain into the mode that works best for them. And don't think you're stupid if your brain works best one way or the other - we're all wired differently! That is what makes the world go 'round. See what I mean?