Garden Shredders

I'd love to help, but I know nothing about any of those three!
Hopefully someone will be more helpful

I used to have one.

Got rid because of 'lack of use'.

OK, you may use it more than I did, but you may want to weigh up the cost against buying one, and hiring one just maybe once a year.

I used to have a chipper/shredder with a strong B&S motor and it did a very good job of chipping things, including dogwood branches, which for their slim size, are very hard to chip normally (too slick). The more powerful motor didn't clog provided you fed it slowly and let it clear before pushing in the next handful.

Most important, you need to determine just how much overall largish branches you'd chip each year to determine what size and cost best suit you. If you're mainly into pencil thick branches, then you really don't need the big papa like I had.

Sadly, we neglected to cover it in the garage (which doesn't leak) and it rusted all the moving parts, so it was hopeless to repair since you had to remove literally a zillion screws to get at the motor parts. So do be sure you have somewhere dry to store whatever you choose.

I have the bosch and i'm well pleased with it. There are 2 types of shredder, 1 has a blade similar to a rotary mower at the bottom of the funnel which chops most things up to 15 mm in diameter. The one i have has a screw drive at the top of the funnel which crushes anything up to 30mm. The screw drive one's are a lot quieter but are no good on soft green growth. In an ideal world you would have both but if i had to pick i would rather have mine because it chops up the larger stuff and the soft green growth will rot down quicker than the big stuff.

I bought an Alko from Argos with some vouchers many years ago. The entry hole was tiny and it wouldn't even shred a small Christmas tree pruning so, when I retired, my OH persuaded me to buy an expensive, petrol-driven one. When assembled, it was huge, heavy, and my OH fell into my raspberry canes getting it out of the shed  . Branches were ok when you put them into the branch hopper, but prunings didn't fall to the business end of the other hopper. I decided on a Viking shredder (made by Stihl) - I think it is the GE250 model, and it is brilliant (I call it Ethelshred) .  I just grab an armful of prunings and stuff them into the top, then another armful which I stuff into the top and the first lot goes down and gets shredded. I got the shop to throw in a collection box which is also great. The resultant shreddings go into one of those large bags with handles that you get sand delivered in, and I leave it to rot down for a year or more. I have two of these bags so, when one rots down so far, I empty it into the other bag and have another one to fill whenever. The shreddings are great as a mulch.