Speaking as someone who does both: Web tech is more immediately rewarding. With C++ (and especially with modern web dev agile processes), you can spend a week

Speaking as someone who does both: Web tech is more immediately rewarding. With C++ (and especially with modern web dev agile processes), you can spend a week building enough framework and infrastructure crap to stand up the barest inkling of a demo of the solution you plan to implement, only to have the whole thing pivot out from under you and become wasted work. More complicated languages and frameworks that manage memory and do UI and everything for you let you get to a prototype much faster, so you can see whether it'll work or whether you want to toss out the idea much sooner.