not talking particularly about release ow, from 2016 to 2019 ow was great and then they decided to work on this sh1t game we have now, so we got no content for 3 years all for a horrible pvp experience thanks to 5v5 and role passives and no PvE all because Ow2 was supposed to redefine what a sequel means and hey it did, but, 5v5 or 6v6 it’s up to preference there is no doubt 6v6 was better, but, i recognize that 5v5 has a faster pace gameplay i will give you that and for some time the q times were way better than back in ow1, but, nowadays not so much.
In conclusion keep 5v5 but implement 6v6 as a classic mode or client.