To be honest both games are great and i would advise everyone who likes strategy games to give go a chance if he hasn't already. Main difference between those games is the abstraction, chess is easier to understand since you have different kind of pieces and a clear objective while in go you need to surround territory which can be achieved in an unimaginable amount of different ways which results to people getting lost. Also go is less formulated because it is(was) hard to point out which moves were bad while in chess it is a lot easier(not talking about uber complicated variations which ofc both games have but more in the spirit of in chess you do a mistake you lose a pawn, a piece etc while in go you make a mistake now and by the time the mistake manifest it is already lost in 30 more moves)
Now on topic neither game is more complicated than the other in my opinion but go is harder to learn since there were not many teaching tools like widely available engines and also memorization of moves doesn't play that big of a part, in chess there are openings that can carry you to the end game while go opening ends in about 5-9 moves(or less).
PS:Go is way more ancient than chess(aprox 2500 years old), opening theory on go got revolutionised around the same time that chess did but AI had a greater impact on go because moves in go are harder to judge, emanuel lasker which holds the longest reign as world champion had some very interesting quotes about go such as
I love this way to put it!