IPhone 5c vs. iPad air which is the best?

It really depends on what you want to use it for. If you need a new phone, obviously the iPhone is probably going to be the most convenient (and ultimately most cost-effective) option. Also, if you like the option of bringing the device with you wherever you go and being able to fit it into your pocket, the iPhone is also a good choice.

But if you are going to be playing a lot of games, watching movies, or searching the web, the iPad will definitely be easier to work with because of the larger screen. It will be kind of bulky to carry it around with you, but if you're mostly going to be using it at home it's a good choice.
It really depends on what you want to use it for. If you need a new phone, obviously the iPhone is probably going to be the most convenient (and ultimately most cost-effective) option. Also, if you like the option of bringing the device with you wherever you go and being able to fit it into your pocket, the iPhone is also a good choice.

But if you are going to be playing a lot of games, watching movies, or searching the web, the iPad will definitely be easier to work with because of the larger screen. It will be kind of bulky to carry it around with you, but if you're mostly going to be using it at home it's a good choice.