Simultaneously?
If so, neither of these are good for you. They both have two inputs.
Ok, the echo has spdif also, but that's not really useful here.
You'll want an interface with two lines ins and one instrument in, OR several line ins and a separate DI box.
If not simultaneously, the apogee is most suitable as it's inputs support mic/line/instrument.
Echo makes no mention of instrument input as far as I can see.