I used play e4 but got blasted with the Scandinavian and switched to d4 but then switched back cuz I'm more tactical.
1.d4 players prefer to slowly take over the castle, while 1.e4 players like to crash through the door and attack as fast as they can.
I've spent some time recently trying out e4 and I find the Ruy Lopez and Itlian games can both me much less tactical and much more strategic than d4. So really it probably comes down to which opening give you a playable position that you understand well enough to take into middle game.
I play d4 now. Played e4 my whole life. I prefer d4 and the only thing I really miss is cracking the following:
Oh, how I miss that blunder.
I almost always play d4. It is protected, and it is definitely NOT boring!
"I almost always play d4. It is protected, and it is definitely NOT boring"
It depends of the lines you are choosing (IMO the Tromposky is maybe more funny to play than the exchange slav, though this latter can be interesting). It also depends on what you find boring. It is simply a matter of opinions.
1.e4 or 1.d4? 1.c4 
i dont know im bad at both
C4
It might depend on the style of play
I personally love to play 1.e4 more often but 1. d4 is also a very strong opening for a few of the best openings such as Queen's Gambit; Declined , London System, Grünfeld Defense
both are playable at any level, even Alphazero plays both these moves, so I am content to say they are about the same value.
I used to believe d4 was fine as black against anything white can play. I still do, really
But I do not care to lead with it as white. Its fine, but I grew tired of it at one point, may go back one day...
1. Nf3, because it can transpose into any opening. I like to keep them guessing.
e4