I think the plunge into battery op tools requires some thought. I think it is best to standardize on one brand/platform if you can to keep your battery count/cost. down.
I have been using Stihl gassers for some time and recently been making the move to Stihl battery tools. Decided to go with AP battery line vs. AK for more power since I am used to gas. Couldn't be happier. Sold all of my gassers except my string trimmer until now. Didn't want to give up my Stihl FS130R but I am now convinced I can depart with it if someone will pay what it is worth.
That said, Stihl is expensive, but I like to buy tools and expect them to last a long time. Never been disappointed with Stihl. I even use my battery chainsaw 95% of the time vs my gasser.
If you are not using your battery tools often, then don't spend the money for top of the line. Sorry I don't have any direct brand comparisons though. Good luck with your purchase, but think long term and what your 'fleet' might look like. For instance, I settled on Dewalt 20V cordless hand tools for my shop quite awhile back. Nice to not have different brands, different batteries and a wall of chargers.
Bottom line, it really depends on how much you will use them and how heavy duty do you need.