PowerBlocks and Bowflex's SelectTech adjustable dumbbells have pros and cons, and which is best ultimately comes down to your personal needs. Bowflex offers a simple mechanism to adjust weight that most users find easy to manage. The dumbbells seem slightly more user-friendly when it comes to transitioning from traditional dumbbells to an adjustable version. Bowflex dumbbells are also shaped more similarly to traditional dumbbells, making them a little easier to use.
PowerBlock, on the other hand, provides lots of options to users for expanding most sets, making weight adjustments, and using add-ons to provide a more extensive, compact home gym. When comparing similar dumbbell models, the prices tend to be comparatively close. response time than PowerBlock. If it's important to you to be able to contact customer service if there's a problem, PowerBlocks may come out on top.