Trikes or Bikes.
Most of us are used to riding bicycles. They've typically been our main form of cycle since we were 3. As such we've become accustomed to how bikes ride. We've learned to gain speed in order to balance, put our foot down when we stop and lean the bike over when we turn. These things have become so natural for us we forget we are doing them. Sometimes when people try a cargo trike for the first time they forget it handles completely differently. This can be quite disconcerting to the unsuspecting rider.
Trikes are of course different to bikes and each has their own strengths. I usually explain the difference this way.
If you had only ever ridden a trike and you tried to ride a bicycle. would you know or remember to put your foot down when you stop and would you feel natural riding it on your first few times. Would you feel safe on that first outing or would you take a few rides to adjust?
The answer of course for most people is "probably not" Riding a trike takes a little bit of getting used to as does riding a bicycle for the first time. Once you have adjusted to it, it feels very natural. Some people adjust quicker than others. I have found that many keen cyclists have found the adjustment more difficult than novices because the novices have less frame of reference or expectation of how it should feel. Two wheelers suit some and three wheelers others. They are quite hard to compare directly as they are different beasts.
Here are some of the pros and cons of each:
Typically we recommend that if you want to ride long distances or ride fast then a two wheeler is the preferred option. Otherwise you just cannot compare the practicality and ease of a three wheeler.