In general you will get better performance from an Ethernet as compared to MLPPP. For one thing with Ethernet you are dealing with a single interface that starts at 10 Mb (or could potentially be higher) where with MLPPP you are dealing with multiple interfaces which start at 1.5 Mb or 2 Mb and go up by that value as you add additional interfaces.
Also with MLPPP you are dealing with additional software overhead which will manage transmission of data over the MLPPP on the transmit end and deal with receipt and re-assembly of the data on the recieving end where with Ethernet there is no additional software required.
There are some situations where MLPPP is a better choice, especially situations where the sites are far apart (the serial links used by MLPPP are designed to operate over long distances where Ethernet does have some distance limitations).
So I agree with Giuseppe that if you really have a choice between using an Ethernet of MLPPP usually the Ethernet is the better choice. But sometimes you may not have much choice.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...