have a 87 cutlass doing a budget build looking to improve handling. which rear sway bar would be a better fit for a daily driver.. frame mount are lower control

 

Daily driver? Lower Control Arms (LCA). The holes should already be there to mount a factory sway bar, and you can either find someone with sway bar spacers and shims (if needed), or you can make all that yourself or get someone to make them for you if you have to. It'll be easier to find a factory sway bar to fit a Gbody this way. No measuring, adjusting, etc. Bolt it in and go, pretty much. There are generally 2 sizes. F41 (HD suspension) and non-F41 style sway bars. F41 is thicker. If you go aftermarket bar, just get one to fit LCA Gbody and you'll be good.

If you were really going to corner carve, the frame mounted would be better. But for street, you'll be fine with LCA mount.