5-0 on ledges definitely look and feel better straight and balanced to me, plus it's super fun to see what kind of pop you can get out of them that way. sitting down with all your weight over the tail scraping throughout the whole trick looks so gross it barely even 'counts' (ha ! funny concept), to me.
also I think nollie lips and tails can look super rad, they have a wilder aspect that normal lips and tails don't have. but yeah I guess it depends on what you're doing them on. the lower the ledge, the weaker the aesthetics. I also like doing nollie smiths and nollie 5-0's but I am well aware of how gross they may be (although I do like nollie b/s 5-0, that one can look powerful).