We take both wherever we go. My ds is almost 30 lbs at 13 mos, and I have chronic horrible back pain, and pelvic separation still from his pregnancy and delivery.
So on one hand, if he's happy in a stroller, I will often use that (easier on my poor body). But if he is needing to be carried, it's MUCH easier on me to wear him in a mei tai than carry him in my arms.
Now, we are just starting to enter the world of walking, which is a whole other option. He wants to do that all the time now.
Andrea - Mama to Lexy (9/7/05) & Serenity (3/14/09)! My Feedback: DS EBay