For the $10.00 difference in the two kits you posted I'd go with the 5" just for the added tire and steering clearance. The 4" kits cut it close with some brands of 22" tires. I like the kits that come with the spindles like the ones you linked so theres no need for the bolt on spindle steering arm risers. One thing to remember on the new style ezgo steering is the drag link will be the lowest point on the front end with a drop axle so that extra 1" will be nice. If it was me and I was going to use one of the two you posted I'd go with the 5".
I've never bought anything from the seller you linked to but I've heard his stuff is good quality.
Those lifts are made by Allsports, I have that 4" lift on one of my carts which I bought from that company. I really like those kits and use them when lifting any 2001.5 and up ezgo. SEGC or EC are great people to deal with, I buy alot of stuff from them. I had gotten the wrong lift kit on an order from them one time and EC overnighted the right kit and gave me a $50 credit for my trouble. You can't ask for better service than that IMHO.
I'll show you the difference in a 4 and 5 inch lift. These are my carts. The green one has a 4" lift with 25" tires and the white one has a 5" lift with 25" tires. I personally like the 4" better because its just enough to clear 25" tires and it keeps the center of gravity lower.