I wouldn't say I
know, however, I have some thoughts. Again, I refer to John Kohler (no, I have no affiliation with him or any of his sites, I simply refer to the information he's provided). You can see
here and
here his thoughts and he has far more experience with them than I do. I also stumbled upon
this page which seemed to agree with at least some of John's thoughts. One comment I'll make about that last page is that they claim that the empirical and anecdotal evidence suggests you don't need to drink the juice straight away, however, I already linked to a published paper where they showed that
fresh cabbage juice helped with peptic ulcers. Subsequently, it seems to me that in some cases having it as fresh as possible is a requirement. In this case I guess making the juice for a whole day in one go is probably an acceptable compromise (especially if you remove as much air/oxygen as possible by filling glass bottles and storing them in the fridge).
I consider it psuedo-logic when people suggest centrifugal juicers raise the temperature of the juice because they operate at high speed. Unfortunately, statements like these seem to be similar to hearing one side of the story. What I mean by that is you could also argue using similar logic that "cold press" juicers would heat the juice more because of the high pressures involved.
When choosing a juicer there's a number of things to consider, how noisy it is, how easy it is to clean, how efficient it is at juicing what you want to juice, etc. You can see plenty of comparison videos by John Kohler on Youtube, unfortunately he has the gift of the gab and talks a lot so it may take a bit of time to watch them...
Contrary to what SweetSue said, while I was thinking about what to say in this response I thought you mentioned that you were getting a medical card or something so you could get medicinal cannabis which says to me that it's legal in your state. I have no idea how all of this works but you could always try to find out where they grow their crops and see if any of them are willing to give you any clippings they would normally throw away. You could then include these in juices/smoothies as well. If you search for "John Kohler cannabis" you find a video "How I Got High for 10 Hours on Raw Cannabis Leaves" (I swear I'm not associated with him, I'm not even in the same country!) where he uses a vertical single auger juicer to juice the cannabis leaves (I'm not sure how goo this is compared to the lemongrass juicer).
Finally, have a look at as many videos and read as much as you can before deciding on a juicer. You may find that the more efficient juicers don't justify the cost when you consider the cost of what you'll juice. On the other hand a small improvement in efficiency may make all the difference in reduced produce costs. It depends on how much each are where you are...