Originally posted by 7 up
Saying one's port is better than the other one doesn't necessarily mean the latter is bad, it's at least inferior.
also consider: is the new port the proper venue to call out a different one entirely? "better than [author]" only has the mere intent that the new one is good, but all it does in the end is call attention to an older one for being worse, which while is only offensive depending on who you ask, it can still fall under the general behavior rules for what not to do. saying the other one sucks in particular is even worse in this regard, and is just flat out bullying.
besides, if a submission is truly better in every conceivable way over the other, then that's for the mod team's discretion to determine should they choose to remove it as an obsolete submission - not yours. say something respectful or say nothing, that's the key.