Everyone has a budget. If your budget allows, go for quality - it can be resold which makes the initial outlay that much less.
Over the past 15 years i went from a glove attached device (worked fine for the days I could actually catch what he threw), to a really cheap hand held gun (lasted a season), to a Stalker Pro.
The SP was unquestionably expensive. Bought it when S was 16 (definitely overkill initially). Every few years i ship it back to Stalker for routine maintenance; have gone through several battery handles, and never had any other issues. When you look at the market for used SPs in great shape, you see that the value has really held up. i bet I could sell it today to young dads for 50 - 80% of the initial price - couldn't do that with the other devices which had residual values of zero.
It was an expensive vanity purchase which has gotten a lot of baseball use over the decade. (If you can stand to be pegged as "that dad," I have used it at tryouts (amateur and pro), lessons, all levels of college, HS, pro games, showcases and camps. Over the years, its been well used; but I know other dads who made similar purchases and used it for a season. Only you can speculate whether a big purchase makes sense.)