I have a Champion juicer and am pondering getting a better juicer. The issues I have with it:
-- It doesn't really do greens.
-- It produces a lot of froth with certain produce like apples.

This is the thick froth it produces:



I found this description of how to juice greens with a Champion on an Amazon.com review:
But is he even correct? Does anyone here have a juicer they juice greens with, without going through that effort of alternation?

The champion I have is a masticating juicer:


What are the pros and cons of a masticating juicer vs a centrifugal model?

I created a related topic in the past, after being swayed to consider a Breville by the documentary Fat, Sick and Nearly Dead:
Topic: Juicers: Breville vs Champion

Different juicers are better for juicing different types of produce. Most juicers that juice soft fruits can't juice greens, and vice versa.

Yes and no. He's wrong when he says that you need to add harder vegetables to push greens through, but he's right that sometimes they need help being pushed through. You may need to use a tamper/plunger to push the greens down.

However, I only juice greens, so no you don't need to alternate with other vegetables. If you want a good greens juicer get a wheatgrass juicer - you can get manual ones for around $50, or automatic ones for bit more.

You should only use masticating juicers, centrifugal juicers cause excessive oxidation and heating and destroy large amounts of the enzymes and other nutrients. A centrifugal juicer is better the nothing, but far inferior to a masticating juicer. Take it from an experienced juicer who knows: there's also a huge taste difference between juice from a centrifugal and juicer from a masticating juicer - masticating wins hands-down. That's because of the oxidation the juice from the centrifugal juicer goes through.

This is something I posted on another forum:

"As for juicing, there are two main types of juicers out there - centrifugal and masticating (same say that twin-gear, or triturating, juicers are a third type, but I classify them as masticating for simplicity). Juicers also come in both automated (electrical) and manual versions.

Centrifugal juicers tend to oxidize juice much more rapidly then masticating juicers, which results in greater nutrient loss and less healthful juice. Drinking juice from centrifugal juicers is still far better then not juicing, though. If that's all you can get, go for it. (Single gear) Masticating juicers cause far less oxidation and preserve more nutrients, as well as extracting more juice from the fruit/veggie (more bang for your buck). Twin-gear juicers extract the most juice and cause the least oxidation, but generally cost the most.

More on the different types of juicers: https://www.harvestessentials.com/whatjuicisri.html
https://www.bestjuicers.com/juicertypes.html
https://www.juicingandrawfoods.com/types-of-juicers.html"

I have an oster I bought in 1987 and it is still going strong. It does greens and when I do apples or oranges, I do get some froth.