Benefits of a Buchner funnel w/ a fritted disc instead of Quantitative Filter Paper Circles I was wondering if someone could enlighten me on some example us cases where one would be better of using a Buchner funnel with a fritted disc (example), as opposed to a Buchner "style" filter (example) that requires a filter paper (example).

A few times in the past when I was looking to filter a specific substance and asked about fritted discs, most of the replies were "don't use a fritted disc, just use a funnel with the filter papers instead," and this got me wondering when using a fritted disc would be preferable over a filter paper. Originally, in my chemistry naivety, I mentioned that I may end placing a filter paper inside a Buchner funnel with a fritted disc, to "get the best of both worlds" I suppose, but this idea was shot down pretty quickly.

Heres the pros/cons list for both filter types that I have thus far, hoping some can add to it:

Buchner "style" filter with filter papers


Pros


The filter papers are cheaper
Changing the filter paper pore sizes are much easier, as it's just a matter of getting the filter papers with the desired pore size
One can easily cut the filter papers to the proper diameter if needed

Cons


??



Buchner filters with fritted discs


Pros


Filters are reusable if cleaned properly
???

Cons


Fritted discs are much more expensive than filter papers
Fritted discs don't seem to have specific pore sizes
Fritted discs seem like they can be a pain to clean properly



Thanks in advance for any input!
Buchner + filter paper cons:


The filtering surface is not uniform. It filters only where the holes are, so most of the surface is not working. 
Some solid can slip between the paper and the filter.  Then the filtrate must be filtered again. 
You have to cut the paper. 


Fritted glass filter pros:


Uniform filtering surface. 
Pore sizes from number 1 (coarse) to number 4 (fine). In organic chemistry, number 3 is the standard. 
Can be cleaned easily when the solubility of the product is known. 
Can be sterilized at high temperature. 


I use them almost for everything except for filtering activated carbon and very dirty unknown samples. If the solid does not dissolve in solvents, we try with concentrated caustic, concentrated sulfuric acid or strong oxidants; in that order. 

It is better to buy the ones without the vacuum connection. 
They are cheaper and have less points where they can break.