The old system restricted choices via a couple prerequisites for PrE's and a maximum AP possible to spend. And gated this with minimum class levels. All enhancements that were available to a race/class combo where purchasable until you ran out of points. Total AP spent was simply a way to keep you from getting higher tier abilities too soon, but did not restrict your choices in a meaningful way.
The new system adds AP spent in tree as a new constriction and arbitrary means of eliminating possible choices in other trees.
The new system adds lots of "prerequisites" in AP spent and "branches" (arrows) paths you have to follow to get things that used to not have that. Even to get normal non PrE abilities. Forcing you to take things you wouldn't have in the old system.
It relaxes the class level gating which is good but only for the moment as I expect we're not getting Kensai III Critical Threat increase with just 5 levels of fighter. in fact I'd be shocked if it's lower than 16.
It locks out mundane enhancement choices by putting them in PrE trees that they don't really belong in (such as FE and many others) as pure filler.
It compartmentalizes all enhancements into pretty but arbitrary "trees" which restrict what you can choose by the fact that you can only choose from X number of trees (X being the number they finally decide on, probably 3 or 4).
And finally it has the same maximum AP spending restriction. And also has prerequisite AP costs for PrE's (which actually appear to be elevated significantly)
So in summery the new system has 4 new constrictions of choice in addition to the 2 old constrictions, and for the moment, has less restrictive class level requirements.
So just purely objectively comparing the two we have:
2 choice constrictions and seemingly higher level requirements.
6 choice constrictions and lower level requirements until they raise them significantly which they are sure to do*
* once they lower some of the AP costs; Which will be billed as the give and take necessary to lower the AP costs that are artificially high (obviously the class level requirements being artificially low right now as well there's no way they leave them where they are).