Honestly the affect of most edges is really minor, they are nice to have but not silly.

A couple edges open up niche things, they are not all expensive, for instance master embalmer is cheap and really gets a lot of mileage. For muter the best edge is master of leisure because you can run around hasted to jump on short windows of opportunity. The plague edge is solid for drawn out group fights as a shaman.

Really for any given class there are likely 3 or less edges that will have a real measurable impact on your game, and how you play the class will make different ones ideal.

For me I like the explore system, since learning I needed to get so much at low ranks I have re done areas I barely paid attention to the last few decades and have found some nifty things, not all of which had points tied to them, for instance there is some cool stuff on tombstones in the galadon graveyard that gave me role ideas.