I've tried several and launchbox is in the best of breed tier, there are a couple of others, boxer that's only for osx and another which I don't remember the name of that's one of the listed frontends on the dosbox website that's now a dead link, it was the only comparable alternative to launchbox on windows. If I recall there might have been another one but again, dead link.
He does a little passive aggressive routine with defaulting graphic spacing on the large side with spacing adjustment behind his paywall, game manual access is behind his paywall as well, standard frontend functionality on all but his. If I recall correctly he may have made custom field additions limited as well, again, standard feature for everyone else. There's also some other fields behind the paywall like using steam graphics/field, but I'm not bothered by that, I don't really know the steam graphics enough to pine for them, I prefer using box, disk, maps, ads from magazines and box contents for graphics rather than custom present day stuff, my idea being the graphics on display represent/replicate what you would have seen back in the day and in use.
A distinguishing difference to me between best of breed and the rest is that content is the focus/front and center in the best of breed frontends while the frontend is front and center for the rest, contrast launchbox and boxer with d-fend and dosbox game launcher to see what I'm talking about.