Heigiger. I have both the big body clippers and the small Saphir. They are work horses. Mine came with 2 batteries each so I never run out of juice. Bonus, they are both several (6? 8?) years old and still going strong clipping cows and horses. Both will do full body clips (the Saphirs take a T-84 blade) but the big guys are obviously quicker. I use the small ones for nervous animals. The big ones are not near as noisy as plug-in body clippers but can still be a bit much for those that lose their minds about clipping.
You will LOVE not having hair blown in your face. Love it. I will not use corded clippers again any time soon.
Also, you don’t have to wait/pay for Heiniger brand blades. I’ve been using Oster/Clipmaster for the big guys and Andis for the Saphirs.
All these wonderful things said - please sit down before you investigate the price. They are not cheap.