The Phoenix Deck is simply another style of deck in the market of Scooter Decks. They came after the TSI. Matter a fact they are made in the same city as the TSI. The phoenix guy's kids go to Tron (our local park) and he saw some riders riding a TSI and thought he could make one too. So he did 5 months later. A 4.5 wide deck with 3* of concave. Square down tube. Looked just like a TSI with all the specs matching... Except it had a Razor Brake and a different head tube angle and this deck was an extruded style deck just like the Ultra Pro. There are now so many different styles of decks out. You can pick which one fits you best. If you want something that is super uber light and with a super sweeped head tube then sure buy a Ultra Pro. If you want something for going big and flowing bowls and Vert ramps then you would want to go with a TSI FlowMaster. This deck is designed for Transition and airing out. Doing BIG tricks not little kiddy flat land freestyle like so many other drive way scooter riders. That's why we came out with the TSI FreeStyler. This deck is a little heavier then a Ultra Pro, but feels closer to it. The FreeStyler only comes in 4" wide. This is because it's compared to the Ultra Pro which is 4" wide. TSI also has a Larger model for the bigger riders out there. Riders who are 5'8"+ and are around 160-220 lbs. This deck is made for 125mm wheels. One of the only one-piece decks that is made for that size wheel.
If I went on about more decks it would take too long. So just go with what best fits you.