I've seen many posts asking which job is strongest in bossing, which job is strongest in mobbing, or which job is stronger in comparison.
Here's the thing, there's no solid, singular answer. It's all different based on different situations.
Which job is strongest in mobbing? Well, what level are you planning on going to? Are you going to stop at 200, or are you going to keep leveling up beyond 200? DawnWarrior's mobbing is fantastic below 200 and suck at above 200, while marksman mobbing is crap below 200, but is really good at above 200. If you're planning on going beyond 200, which level region are you talking about (200-210, 220-225, 230-235, 235-250, or 250-275)? Zero's mobbing ability at 220-225 region is not good but starts to go up as maps change in 225-275 region. And how strong are you planning on making your character? Classes like Blaze Wizard and Evan's mobbing ability can either be godly or hellish depending on whether or not you can do one shot kill.
Which job is strongest in bossing? Well, again, how strong are you going to make your character? There are classes like Evan who are "weaker than most when not funded, stronger than most when funded" types. And to what boss are you planning on running? Are you just planning on c.vel, n lotus/damien, lucid/will, verus hilla, or even all the way to black mage? Demon Avenger is pretty decent in CRA, but becomes extremely unviable as you go to high tier bosses. What aspect of strength in bossing are you looking for? Are you looking for good damage, good survivability, good utilities, good party synergy or etc?
Let's say you have all the answer to these questions. Even if you're know all these factors inside and out, it's not gonna matter because a single patch note can change everything. Kanna, whose job name is often confused to be kishin by a few people, became pretty good after revamp. Classes like Night Walker and Angelic Buster, whose damage output was once known to be opaf, have all gone through series of nerf patches. Classes like Dawn Warrior, Wind Archer or Dual Blades, whose main mobbing skills aren't that great, got buff patches that made mobbing abilities better and are going to get more buff patches in the future.
The point is that there's not really a solid singular answer to which job is "strongest" and it's foolish to pick a main based on things like that. Best thing to do is to pick a job that you like and enjoy. If you really enjoy a job, whether it's strong or not, you'll be able to invest and fund the character easily. Even if it's a weak character, it's probably gonna get buff patches that will balance it out in the future. If you play "strong" job, but doesn't enjoy playing it, you're simply going to quit the game (wait....this is the best case scenario actually hmm). Or worse, you enjoy your "strong" class, invest a lot of time and money into it, then gets nerfed to the ground.