Here’s a lovely spreadsheet created by Mai. It might be a little out of date, as I think it was created during version 1.5, but still relevant. E&P – Loots and Stats - Google Sheets
Here’s a clip from the spreadsheet. For your question , you’d be focusing on the Item column. As you get loot only if you complete the level, it doesn’t really matter what you get from killing each individual monster. And note, the numbers listed are averages. Each time you run the level it might be a bit higher, or a bit lower.
for the full thread go to: Mai's Guide to Efficient Farming – List of best lvls to farm monster, different resources, wanted missions and XP