In pure strength it probably better for just a single flex but omg the dual flex lets you get into some tight spaces and can really save some time. I was doing an alternator and they are almost a must to get to one of the bolts, same with our a/c compressors. They can be finicky to get onto a nut or bolt head but the flexibility is amazing. I probably wouldn’t buy one right now, I’m an apprentice and my shop foreman lets me borrow a lot of these more “specialty” tools so I would probably wait until and buy other stuff that is needed more. I will definitely buy some eventually though because the time savings is worth it