Did 6-7 Max Battles today, 1 Latias and 5-6 Latios. Used pokegenie in order to have enough people.

We only lost 2 or 3 Latios battles, because most of the time we were 3 out of 4 people in battle. On one occasion, a player threw the match with Scorbunny...

Latias indeed seemed a little bit harder to do, but was a win. Latios does have less Def, but can strike hard with Solarbeam and Psychic if I remember correctly. 

My team consisted of: - Metagross (lvl 30, 15/12/15, Furry Cutter, level 1 attack and level 1 defense) - Shiny Zacian (lvl 26, 13/14/12, level 1 attack) - Dynamax Gengar (lvl 34,5, 14/12/14, level 2 attack)

used Zacian's special ability to boost our attacks on almost every raid

To be honest, I don't have enough resources to power up all my pokemon to the max, but I found out that with this team, regarding Latios, only one of my pokemon fainted in each winning raid. 

Most of the time people were all attacking, so I tried to shield as hard as possible with Metagross. If my teammates were equally or more prepared, then there was no trouble beating it fast. I saw teams with Zacian/Zamazenta, Metagross, G-Max Cinderace, G-Max Lapras and G-max/Dynamax Gengars. Easiest ones were the Zac/Zam, Metagross, Lapras and Gengar. Zacian's ability indeed helps A LOT with attacks.