I heard high gold is nice bc it has a large portion of the players really trying to work together to get to plat and struggling to do it all solo, and so they are kinda forced to band together and be more team oriented. Same guy said that plat is the absolute worst because it's all the players who are just really good and have awesome mechanics so they carry hard in games and got past gold, but they don't have the team work to get to diamond. They're so used to being able to carry games on mechanics, that when they are against people w/ equal mechanics they just get frustrated and rage rather than working with the team as much as a lot of gold and diamond players do (obviously that's not all of plat, but he said plat has the highest percent of players w/ this issue).
My experience is that low gold can be good, but also can be complete shit because you end up w/people who are suddenly conceited because they got out of silver and have end of season rewards, or they just don't really care about climbing past gold 5 because they have end of season rewards at their current level.