Better is a matter of opinion, and taste is very subjective - but, somethings simply do taste better than others - as a matter of opinion of course. There is an age old saying that you simply can't polish a turd - regardless what you do, it's innate turdness will shine through. Call it what you want - editing, correcting, adjusting, perfecting (but then again, one man's trash is another man's treasure), but in the end, good song writing will always remain; it is everlasting.
Time tends to be the judge of what constitutes well made, well written music. What may taste good immediately and may sound good for a little while really amounts to nothing if years down the road nary a soul remembers it was made. Even in this genre we call metal (including the ridiculous sub-genre nomenclature we have) there will always be the cream that rose to the top and stood the test of time. It will be interesting to see years from now if we look fondly upon some of the music produced today. Only time will tell, but I have a feeling that if it is a good, and I mean good, song - it very may well - but they truly are a rarity (and I don't just mean today as there has been lots of music from the past that is long forgotten and did not stand the test of time.)