I use a diaphragm pump that is rated chemical duty for running DCVC and filtration via Buchner funnel. No other style is suitable. I do not run a cold trap in any scenario.
I use a dual vane pump for creating the vacuum needed for mean free path (MFP) flow conditions inside a distillation apparatus. For me I set the target no higher than 15 microns but typically can pull down to one micron during MFP operation of my sublimation apparatus. I remove the bulk of the lower boiling compounds than THC via a liquid to liquid extraction so am not ingesting much terpene but a little does foul the oil. This is easy to remedy by swinging the pressure from time to time and allowing fresh air to flush down through the system but avoiding the distillation process by valve placement. Ingesting terpenes does not harm this pump but will in time damage the oil to the point an oil change is needed. A simple operation.
It takes two pumps when coping with heavy fume first and requiring MFP conditions as well. The two do not cross over. I chose a dual vane pump for MFP operations because they are built like tanks and by design sacrifice the consumable pump oil first before the pump itself croaks. They cannot tolerate very much organic solvent fume though before failure and are simply the wrong tool for operations regarding fume. A diaphragm pump could never reach MFP conditions in a distillation rig but if outfitted as chemical duty as mine is they are rated to tolerate organic solvent fume all day long. The internal wetted path is all PTFE (teflon) and seems to tolerate even the inevitable hexane or ethyl acetate fume produced from DCVC. A dual vane pump would fail quickly after ingesting hexane and ethyl acetate fume, so each pump has a niche.
The higher end pumps get more esoteric and also tend to have power requirements and noise considerations beyond what I would ever set up for given my location at home.