They're hard to compare, since they all attack the problem from different angles. Joint Help is mainly a Cissius product, and while Achilles does contain Cissius, it's a pretty low dose, so it's always been recommended that supplemental cissius be taken alongside Achilles for optimal results. They also both contain PPAR agonists (ParActin in Joint Help and Palmitoylethanolamide in Achilles) at similar doses. It's debatable which of the PPAR agonists is superior, both have lots of research, but I'm more familiar with PEA and can positively say it's quite effective for it's intended purpose. Finally, Achilles has a couple other ingredients which serve to round out the formula by providing tendon and cartilage protection as well as further boosting it's anti-inflamatory properties.
JointForce is a little bit different, it's a topical and is more targeted at long-term protection and healing, and not as much as immediate inflammation and pain relief.
If I were you OP, I would stack JointForce and Achilles. JointForce will provide good protection against injury and boost your overall health, while Achilles will fortify your tendons, ligaments and cartilage, as well as provide inflammation and pain relief. While Joint Help is an excellent product, I think it's better suited for acute treatment, and will not do as much to fortify and protect soft tissues. That said, feel free to stack them all if you need to, while there's some overlap in function between Achilles and Joint Help, this does not make them mutually exclusive, and the higher cissius content in Joint Help will surly stack very well with Achilles.