Husqvarna straight shaft brush cutter / whipper with a three point tri-blade. It beats up everything, including 2" diameter trees, thistle etc. Probably have 1000 hrs on it since I bought it. (more hours than the tractor time). Love it, have gone through several blades, and I bought a newer model about 2 yrs ago. Great for bushwhacking trails and general cleanup. It has a string spool also, but I never use that. I never regretted spending the money ... $700 Cdn in 2005, a bit less now. My go to trimmer for 90 %.
Echo Trimmer with 3 plastic prongs for the light duty stuff where more finesse is needed ... house, driveway, stairs, pool, windows, concrete walks etc. Also has string option, but I chose the one with 2 pieces of 8 inch string, rather than the spool. ... about $250 Cdn a few years ago.
BOTH are gas powered, I think about 25 - 32 cc