The Zypher is a foot wider (235cm compared to 207cm) so it should be a bit more friendly in its speed of tricks. Usually the bigger the kite the slower it tricks. Usually. The Shadow has a reported lower bottom end but it's only by 1-2mph which is really not a lot.
I think they both come ready to fly with straps. Which one do you like the look of?
My boy has had a used zephr for about a year now and I bought a new wind meter at the start of summer as well. We've found the zephyr cam fly around 3.5-4 mph sustained with dips briefly into the 2.5mph range. It likes 4-5 He's not all that experienced at low wind flying so that should be factored in as well. We've been plagued for that last year and a half with either too much wind or not enough at every festilval we've been to. The zephyr fills the bill for general low wind flying but I'm also on the lookout for something in the 0-1 to 5ish range as well. I know of an old Nirvana sul for sale used but the sail is a little beat up, ugly tape repair needing redoing ect. but is availiable for about 100$. perhaphs if you have the $ a newer version might be what you need. We also have an atm sul but find it needs about 1-2 mph more wind than the zephyr to fly any kind of decent. results may vary due to a flyers ability level. The key with the zephyr is to make sure the bridle adjustment is set to the low wind setting. It seems to be a tough little kite for the money and can fly in more wind if you adjust the bridle.
Wow! Congrats! I see pink and blue bands on your wrist and a blue and a pink logo on their head wraps. I take it one of each.
No time to fly kites now! If you look that beat, mom must be asleep for the next few days!