Hobart is by far your best option

Reasons.

1. Hobart is situated in large inlet and you can kite in the river (its km wide) and gets a good seabreeze in summer and consistent westerlies in winter
Launceston is situated inland on a small river which you could not kite on and will have to travel 1+ hours to get anywhere to go kiting

2. Hobart is a fantastic town and excellent place to live
Launceston is a hole

3.
Hobart is near lots of surfing beaches on the east coast etc and these are also good kiting spots - catching the SW swells
Launceston is inland and youll need to travel a lot further to get waves etc

4. Hobart has a great windsurfing, kiting and surfing culture cause it has lots of local spots
Launceston does not

Thats all i need to say for now - just remember that Hobart is a brillinat vibrant city, and Launceston is not....

Burnie is on the NW coast so gets OK wind and waves etc along that coast line

At Burnie however its preety industrial and a small town - imagine the port area of Freo for the typical coast near Burnie, so again youd have to travel a bit for kiting as its wharf and factories etc

It would be better than Launceston for kiting - not sure if any locals do it though ???

Burnie is a typical 30,000 population town on the coast surviving off forestry and industry,

not that attractive etc but not too bad.

Id pick Hobart if you have the choice for sure. Might get a bit bored in Burnie in winter time etc, as theres nothing to do when its cold