Mission vs. Arcade

You already started a discussion of farming in your other current thread. In the future, try to keep your discussion of a topic in one place.

Missions are good for farming because they let you jump to lucrative places, such as Firestorm Citadel, without slogging through levels that you don't want. The Arcade is good if you are trying to buy special recipes at Basil, to re-sell to other players. Historically that has been a great way to make money, but I don't know what the market is like these days.

So do missions until they bore you, or until you know enough about the recipe market to figure out how to use Basil.

Still new to the forums and thanks! I'll keep it in mind. Thanks for the suggestion. :D

Random floors always got a chance for graveyards (lots of crowns and heat) or a treasure vault (a whole load of boxes) and this is only found in arcade there are arenas too with lots of rewards (it's like a combination of both but with a higher risk) unlike mission arenas they contain lots of rewards.
On the other hand some of the missions are the same every time they won't change like arcade ex. Boss levels + you can exchange the tokens to a vendor for a gear piece and sell it to a vendor for quick cash.

This depends.

If you are doing missions like "The king of ashes" then you definitely get more crowns faster and a huge heat payout plus a chance for eternal orbs. However if you haven't unlocked that yet / Aren't skilled enough to do it, then arcade is the better option because quitting in the middle of an arcade run is less consequential than quitting in heavy-crown missions.