Hello Justin,
There are a ton of difference between the two cases.
Phantom ///// Phantom 630
5 - 5.25 drive bays ///// 4 - 5.25 drive bays
7 - 2.5/3.5 HDD bays ///// 8 - 2.5/3.5 HHD bays with 2 2.5 behind the motherboard tray.
Non removable HDD cages ///// Modular HDD bays
7 expansion slots ///// 9 expansion slots
1 usb 2.0/ 3.0 slots ///// 2 usb 2.0/3.0 slots each (4 total)
Fans
Phantom
FRONT, 1 X 140mm
REAR, 1 X 120mm (included)
SIDE, 2 x 120mm, 1 x 200/230 (2 x 120mm included)
TOP, 2 X 200mm (1 x LED 200mm included)
Phantom 630
Front 1 x 200 or 2 x 140 or 2 x 120mm ( 1 x 200mm included ) 800rpm
Top 2 x 200 or 2 x 140 or 3 x 120mm ( 1 x 200mm included) 800rpm
Rear 1 x 140/120mm (1 x 140mm included) 1,000rpm
Bottom 2 x 140/120mm
HDD Pivot 1 x 140/120mm
both have fan controllers built in.
The Phantom 630 has an SD reader on it. Offers more water cooling support stock, and a rear I/O leds.
With that listed, its up to you what you want to buy.