I am with Ax on this one. Both are terribly underrated. I am a ATYCLB basher mostly and I really enjoy Grace. Yahweh is absolutely georgious in an unconventional way. So, both are great but I would say Yahweh is the better song. Grace may be the better closer though, with it's beautiful Eno-esque synth outro and slow fade. Feels very complete at the end of the album.
I get the feeling that people who don't like "Grace" and think the lyrics are cheesy don't understand the meaning of the song. "Grace" is not about a person! Bono is poetically giving the attribute of "grace" human charictaristics. "When she goes to work you can hear the strings..." is not talking about some girl going to her job. "She's got the time to talk", once again "she" means the attribute of graciousness. "What once was hurt, what once was friction, what left a mark, no longer stings, because grace makes beauty out of ugly things" is one of the most poetic and profound lyrics Bono has ever written. I just think people are hearing this song all wrong. If I thought this song was just about some person named Grace, then I would not like it much either. But as I understand it, the song "Grace" is a beautiful and powerful statement.