For a home owner in a residential neighborhood cordless will work fine. If you are maintaining a forest or cutting heavy grasses there is no way cordless will work.
The gas version of tools will always have more power and robustness. When I researched pole saws the Echo PPT280 was the highest rated by arborists and can accept a 4ft extension, allowing cutting 21ft into the trees. Take any combi tool out there, be it battery or gas, and there is no comparison, plus you might be lucky to reach 10ft into a tree. I borrowed my friends Milwaukee combi tool with the pole saw attachment to try and was not impressed. I was super afraid of bending the pole. I can't count how many times I dropped my Echo hard on the ground without damage, well other than a bar that bent being taken to the ground by a very large tree branch. So the Milwaukee combi pole saw attachment failed "for me". After putting on the grass trimmer attachment I went to give it a try on oat grasses about 3-4ft tall which is a standard height, and on a good wet year they get over 7ft tall. It struggled, got wrapped up in grasses too often and didn't have the power to keep cutting once wrapped vs a gas that would keep going. The gas also accepts thicker string .110 so it cuts better and last longer. Use only the .095 string on cordless trimmers. I would like to try the Milwaukee combi unit with the hedge trimmer attachment to keep myself off a ladder as much as possible. I've got a brand new in box Milwaukee string trimmer I plan to sell at some point, and pickup the combi unit for light duty work, like when I just want to trim the grass around a planter, not cut the hillside.
The Milwaukee hedge trimmer works pretty good. I also have a gas Echo that is ancient and definitely has more power for cutting brush at its thicker base. The Milwaukee stops often on heavy brush. For routinely cutting hedges along a sidewalk anything cordless of quality would work just fine though.
With a lot of chainsaws of different sizes to choose from, I do like my Makita 14" rear handle and plan to buy the new 36v Makita top handle saw for climbing trees, retiring my gas climbing saw. Hate starting a saw in the trees and having fumes in my face. The Makita rear handle cuts faster due to chain speed, but cutting dried oak it will stall out.
Owning a Stihl backpack blower there is nothing that can compare. The Milwaukee leaf blower does work well on dried leaves, but not wet leaves, where the Stihl moves most anything. Used the Milwaukee Sunday to blow the leaves off the roof, off the deck, out from under the deck, the front driveway, and my arm was sore, but the 9.0Ah battery was just starting to die. The backpack blower is less tiring. The cordless is far quieter, requires no maintenance, well I did let the smoke out of the first one after about 20 minutes of use, and therefore it is quick so it gets used more. Also works great for blowing off cars after washing, tools covered in sawdust, and anything else that requires large amounts of air movement.
Makita batteries and chargers are still some of the best out there. Makita has been using air cooling while charging for years before others started doing so. Haven't had a Makita battery fail under warranty yet, but have had Milwaukee batteries fail and too many Milwaukee tools needing to be sent in for repairs from day 1. No brand loyalty from me, I own both Makita and Milwaukee brands, but have stayed away from Dewalt. Makita does have a special offer until 7/31 on some tools that come with 4 batteries. I bought the 7 1/4" rear handle saw for $249 just to get the batteries. They are offering that promo on yard equipment now though.
