2. c3 is objectively stronger. But the positions we get from those two openings are completely different.
Alapin v/s Smith Morra Gambit against Sicilian. Which is better?

SMG can transpose to the Alapin FYI.
My take from the black side, the SMG is more sharp, tactical and fun for white; black can easily slip with one bad move despite being 1 pawn up.
In the Alapin, black has many ways to equalize and the games tend to be closed positions, even French like at times.

If you play the morra, you have to know the alapin because if they decline you're playing the alapin. So the alapin is better to know. However, the morra accepted can be deadly if you know ALL the lines. They are very confusing and hard to remember but that is what makes it good. I have a ton of games in the morra and have beaten titled players with it. The games go a few ways as follows:
1. Premoving "brilliant" moves to a quick win
2. Crazy tactical exchange.... ?????... opponent doesnt see a tactic and win
3. Lose because down a pawn
It's a good way to learn chess for sure, and you can beat players at any level with it. Alapin much more solid though imo. I just avoid it all now with 1 d4

2. c3 is objectively stronger. But the positions we get from those two openings are completely different.
1.e4 c5 2.d4 cxd4 3.c3 Nf6 is an Alapin.

2. c3 is objectively stronger. But the positions we get from those two openings are completely different.
1.e4 c5 2.d4 cxd4 3.c3 Nf6 is an Alapin.
So is 1.e4 c5 2.d4 cxd4 3.c3 d5, leading to the 2...d5 alapin rather than the 2...Nf6 alamin.
So clearly you need to know the Alapin if you play the Smith-Moron Gambit.

2. c3 is objectively stronger. But the positions we get from those two openings are completely different.
1.e4 c5 2.d4 cxd4 3.c3 Nf6 is an Alapin.
So is 1.e4 c5 2.d4 cxd4 3.c3 d5, leading to the 2...d5 alapin rather than the 2...Nf6 alamin.
So clearly you need to know the Alapin if you play the Smith-Moron Gambit.
OK, but the latter is a rather good version of Alapin for White, as Black has taken on d4 very early.

They both suck! The only reason I no longer play the Sicilian is because of 2.Nf3 and 3.d4!
You don’t like the open Sicilian?

They both suck! The only reason I no longer play the Sicilian is because of 2.Nf3 and 3.d4!
Which line is this? Can anyone xplain?

open sicilian is the best
Open Sicilian is not a bad option, but if black is well prepared, he might be able to get a sharp, double edged game.
I prefer to go for a sideline bcz now it will be you who CAN take black off his prep. This can give you early advantage against players who just focused on mainlines and didn't went deep for such surprises.

Smith morra can transpose in alapin, but is alapin Sicilian theory heavy?
Do you like an open attacking and tactical game or a closed game?
In the SMG white does the early attacking and gets open files on B and C; even minor piece sacrifice opportunities. If this isn’t your personality, then don’t play the SMG.
Alapin games are normally closed and black has many replies such as an early Nf6 or d5 (both considered the mainlines), g6 and b6 side lines. If you like maneuvering and positional games; then the Alapin is the way to go.
Alapin (2.c3) and Smith Morra Gambit (2.d4 exd4 3. c3), which is better to play against Sicilian Defence?