Good thing you like the cold brew it is actually better for you!
Actually more recent studies show HIGHER antioxidants and other healthy benefits from cold brew. Including lower caffeine, so if you would prefer more caffeine and compromise on the health benefits a little go for hot. However, green tea should give a more mellow drawn out energy throughout the day when cold brewed.
There is a lot of literature about the different health benefits of Cold Brewing. Hear is a video on one of the many benefits.
DO NOT heat up the water before cold brewing or put it out in the sun! Cold brewing can be done at room temperature or in your fridge.
If you Google it you will find a lot more literature supporting the health benefits of cold brewing.
Enjoy your cold brewed tea! I too much prefer the flavor!!! Try mixing some fruit or dried orange peal in there as well to add some fun flavor to it!
Also, try Organic Matcha Green Tea for a healthy whole leaf version tea, or put in your smoothies and baked goods!!!