drop member vs cupped lca

[wannagettachevy]

first off, i love this site. long time lurker here, first time poster.

and just so you know ive been doing alot of searching and just cant seem to find an answer. whats the advantage of having a DM vs cupping the lca (with a drop spindle too of course)? it seems that everyone loves their DM's but theyre just so dang expensive and ALOT of work to install (engine and trans removal + frame notch for rack). and from what i can see the cupped lca are cheap and yield tons of drop. and i do have the fab skills reqd for cupping my own lca.