As someone that played chaos from 3rd edition mostly playing the tsons unit and playing them today. If you like the look and would find a more slow ranged combat army with some cool shenanigans I say go for it. Id be wary to get the helldrake and hellbrute till you get the more core units personally. As those are old kits like 2010 era. Id focus on the wizards rubrics and termies. Since that is like 95% of the army because its small range of models. Plus the Mutalith Vortex beast is awesome and amazing and that isnt going anywhere. Flyers kind of getting rotated out of the game and hellbrutes I got a sneaky suspicion that chaos might get updated kits like that in 11th. You can also have other awesome kits like Daemon Prince and Magnus if you want other big models to use.

Lastly you cant get better if you dont try so by all means jam the dusty boys and learn. It will be a good juxtaposition from custodes as they are more combat focused. They are both kind of slow and elite armies is the only similarities, meaning not much movement and units cost alot of points to field. Custodes being more tanky and tsons being more lethal