I'd like to second Scruff... Gyokuro does get a lot of attention... But if you were to offer me a free bag of Japanese green tea, I'd take a top quality sencha over a top quality gyokuro any day of the week.
Gyokuro is great, but I will only buy a bag or two of gyo a year if that. Sencha, I find, is the best.
Den's deserves full credit. They are an old Japanese based tea company, yet they made on outpost right here in good old USA. For this, I am grateful. As far as I know, no other Japanese tea company has done anything remotely like this.
Den's has low shipping, and good tea. A recipe for bliss.
Photiou, Miyabi is deeper-steamed than the other two sencha you have there. This is not actually tea dust or fannings, it is just smaller leaf particle because of the heavier steaming. I'm sure you would agree that the flavor is nothing to complain about?