The Sony will be more expensive, while the Coby will be a bit cheaper and offer a longer battery life.
The color.
A clock and a watch both tell time, but that's a similarity. A difference is that one you look at mostly at home on the wall(not portable), the other you can take with you anywhere you go(portable).
A boombox is a portable stereo; so a stereo is portable and a boombox is not.
The price difference between a portable and stationary ac unit can be up to two hundred dollar. Portable ACs can be very expensive.
Mifi is portable wifi
well the difference is that portable Internet access is portable and mobile Internet access is mobile simple as that.
There is no difference. They mean exactly the same thing. Portable code is independent of the platform while non-portable code is platform-dependant.
Portable means easy to carry round, Optical means uses light to make it work. So optical media could be portable.
A typical portable dryer can be a convenient appliance to have, but some can be quite costly due to the portability convenience. A typical portable dryer costs between $250-$500.
My read is that portable means you can reasonably expect you can carry it about. Transportable means it is capable of being moved - it is not a fixed/stationary item - but it may or may not exactly be portable.
Generic portable generators can vary in price based on size. The average portable generator will run you between 1600 and 2500 dollars. They can go up to 5,000 and higher though.
The price on a portable music keyboard can vary greatly depending on factors such as the brand name, the quality, and the features included. Typically one could expect to pay between $75 and $300 on a portable keyboard.