Bleed vs Burn vs Poison vs Physical Damage
There are soo many factors here.
The main reason physical damage is better is that it has synergy to both crit chance and critical damage. But it is also mitigated by toughness
Conditional damage has its uses, conditions do more than just damage over time, in posions case it reduces healing. Also conditional damage ignores toughness and armor.
Apathy Inc [Ai]
Burn does more damage than bleed, but bleed stacks in intensity when burn only duration. Bleed is better when there are multiple sources or someone that can apply a decent amount, but burn is usually better for people with no condition duration/damage because it does much better damage in its raw (no stats for it) form.
Confusion and poison are a little bit similar but slightly different as well. Confusion does quite a lot of damage in WvW assuming you can make them push buttons. It can potentially do zero damage if you just press escape because you’re under no pressure. Poison always does a decent amount of damage, and potentially some chunks if, again, you can apply it at a time they want to heal or you can pressure a heal.
So poison does decent to good damage, but confusion can do zero to amazing damage, depending on the circumstances. Burn does decent to good damage, but bleeds can do piddly to amazing damage, depending on circumstances. It all varies a lot based on your stats and your opponents stats/utilities/spec.