I always do deadlifts last. Reason being. Is because my 1st is pull up. grip will be weaker if i do deadlift 1st.

for deadlift, i do them heavy and by the end I just want to collapse.

Actually it depend on individual, some ppl prefer before, some prefer after.
The thing is,no matter what you do first,what you do next will probably suffer in some way.

you need go through experimenting,you will have to determine what would be best for you.Everyone is different,with different priorities.