I am looking at 2. Home depot has them. I have some 40 volt Ryobi tools. Eh they are fair. Some better than others. The push mower works great. The poles saw extensions are kind of poor.
I am looking at these 2 trimmers.
I tried the contact Ryobi and after 5 minutes the best they could tell me is the more expensive one was more powerful. They could not give me a weight or how much more powerful. Lighter would be better. Maybe I will dig through the 1000s of reviews.
I am looking at these 2 trimmers.

RYOBI 40V Brushless Cordless Battery Attachment Capable String Trimmer (Tool Only) RY40207BTL - The Home Depot
The RYOBI 40V Brushless String Trimmer gives you the cordless convenience you want with the GAS-LIKE POWER you need. The EXPAND-IT attachment capability allows you to transform your trimmer into an edger,
www.homedepot.com

RYOBI 40V HP Brushless 15 in. Cordless Carbon Fiber Shaft Attachment Capable String Trimmer (Tool Only) RY40209BTL - The Home Depot
The RYOBI 40V HP Carbon Fiber Attachment Capable String Trimmer gives you the cordless convenience you want with the Gas-Like Power you need. A carbon fiber shaft provides added durability. The EXPAND-IT
www.homedepot.com
I tried the contact Ryobi and after 5 minutes the best they could tell me is the more expensive one was more powerful. They could not give me a weight or how much more powerful. Lighter would be better. Maybe I will dig through the 1000s of reviews.