There is video entertainment on the A319 but not on 737's so that is one big difference. Row 1 on an ex ....tle 737 is terrible but it's not great on A319's either (though the AB seats are better than CD). For non-....tle 737's, I like the row 1CD seats because there is a generous foot cut out.

I usually take row 2 on either of these planes but I prefer the A319 because it has video.