The King's Gambit is a reasonable occasional weapon. It is a direct attacking method, and Black needs to be prepared for it. It is not deep enough for grandmasters to make their living playing it, but it could suffice for amateurs.There are even some masters (2200-2400 strength) who have made the King's Gambit their repertoire choice.
The Queen's Gambit is far more complex; it offers far more varieties of positions, more subtle piece play, and is much more difficult to master. This is by far the most popular repertoire choice among chess professionals.
Yes, all main-line openings are playable. But some offer White better winning chances than others. Players who make their living from the game prefer the Queen's Gambit because it optimizes White's winning chances. The King's Gambit, for all its early fireworks, is much less dangerous to a well-prepared opponent.
youve dona lot then! my chess mentor is more boss tho