Sallen-Key or Multiple Feedback Low Pass Filter???

[Bill Mountain]

Good Morning!

I'm playing with low pass filters and I'm experimenting with both Sallen-Key and Multiple Feedback filters as discussed here:

http://en.wikipedia.org/wiki/Electronic_filter_topology

http://en.wikipedia.org/wiki/Sallen%E2%80%93Key_topology

and helpful calculators here:
http://sim.okawa-denshi.jp/en/Fkeisan.htm

I'm trying to understand the reason for choosing one over the other.  The Sallen-Key is non-inverting and the Multiple Feedback is inverting but they both seem to have similar frequency responses.  The Sallen-Key also uses one less resistor but that's not really a huge deal.

Is there a technical reason to choose one over the other?

Is it possible to do either one of them discretely with a simple transistor buffer or boost?

[bool]

You can do a S-K with a simple BJT buffer, no problem. A small signal darlington as a MPSA13 can make it a quite reasonably performing circuit, allowing a lower output impedance among other things.