I know from reading here and word of mouth how simple it seems to do it all from the bottom, but I just hate undoing all the suspention parts. Like the Strut rods, the upper ball joints, the tq arms and stuff. If the engine was detailed and every thing new as like a new restore, I might try it. But when it comes to just replacing an engine or engine / trans combo, I prefer coming out the top. A lot less hrs involved to me and less tools. Around 12 bolts that holds the engine to the trans and k frame, some wires, pullies, and fuel lines is about it once the manifolds are off, or leave on for that matter. I have never had to pull the hood off either. Maybe im old school, but when i'm on a roll, it doesn't take but about an hr and a half to pull the engine when the fluids are drained. You do risk scuffing and scratching paint if your not careful. Especially when you have headers. But as a rule, it goes fairly quick.
So from all I have been seeing and reading here, every bottom install has been with what seems to be everything new, shiney and easy to screw and unscrew. Mileage cars with greasy parts and cruddy bolts n nuts makes a bottom job seem hard to me. This is just my opinion, since I have done probably a hundred or more through the top, and none from the bottom unless it was a front wheel drive car, then I usually do them from the bottom