I know how to do either, but want to know if one is better than the other for particular joints (if so, what cases).
Or is it just a trade off between time / labor (spline) and ease / cost (biscuit joiner)?
In my current case I'm attaching a 3/4 inch lip/edge to a glued up table top (for the top I used leftover unfinished flooring, so that was spline-like).