I prefer loose teas.

My own preferences are Chinese green teas (white monkey) and light oolongs (ti kuan yin and similar). Some people accuse me of drinking colored water since my taste preference is for lighter teas, but the dark oolongs and blacks are just not my thing.

I tend to stay away from the Japanese green teas because they like to pulverize them. They taste fine (Gyokuro is heavenly), but cleanup can be a mess and they tend to be pricey. The Chinese teas are a bit easier to clean up since they usually are whole leaf varieties. Obviously, that is my own opinion. YTMV (taste)

For trail use, I prefer the fillable tea pouches. I use my 750ml pot for a brewing and drinking vessel.