Christ died sufficiently for all, but efficiently ONLY for the elect (SFA) is not the same as universalism, which could be stated as sufficient and efficient for all (i.e. even reprobates like Judas are saved, et. al.).
SFA is error, but better than universalism. While they still affirm limited atonement, they believe that some of Christ's sacrifice was wasted. In addition, it removes any efficacy from the atonement itself. It makes Christs work merely tentative.
Scripture says, by Christ's abundant mercy he hath begotten us again unto a lively hope by his resurrection" (1 Pet. 1:3). Romans 5:10-11 says, "For if while we were enemies, we were reconciled to God through the death of his Son, much more, having been reconciled, shall we be saved by his life.
"When Christ came as high priest of the good things that are already here, he went through the greater and more perfect tabernacle that is not man-made, that is to say, not a part of this creation. He did not enter by means of the blood of goats and calves; but he entered the Most Holy Place once for all by his own blood, having obtained eternal redemption" (Heb. 9:11-12). Just as the Son of Man did not come to be served, but to serve, and to give his life as a ransom for many (Matt. 20:28; Isa. 53:11; John 10:11, 15 ).
"Christ redeemed us from the curse of the law" (Gal. 3:13-14). Christ redeemed us from the guilt of our sin. All his elect are justified freely by his grace through the redemption that came by Christ Jesus (Rom. 3:24). Christ redeemed us from the power of sin and therefore Peter writes, knowing that you were not redeemed with perishable things ... but with precious blood, as of a lamb unblemished and spotless, the blood of Christ (1 Pet. 1:18-19).
There was triumph at Calvary (Col. 3:15). The elect's sin were dealt with at the Cross (Col. 2:13-14). Christ died for his elect (Rom. 5:8) and gave himself for them (Gal. 2:20). As Isaiah says, he was pierced through for our transgressions, he was crushed for our iniquities . . . the Lord has caused the iniquity of us all to fall on him (Isa. 53:5-6). "Greater love has no one than this, that he lay down his life for his friends" (John 15:13).
Substitution is the means by which we were reconciled (1 Pet. 3:18). He is our expiation: He made him who knew no sin to be sin on our behalf, that we might become the righteousness of God in him (2 Cor. 5:21) and He himself bore our sins in his body on the cross, that we might die to sin and live to righteousness (1 Pet. 2:24). Christ took the penalty of the elect's sin upon himself (Heb. 2:17; 1 John 4:10).
Christ came in the fulness of time (Gal. 4:4) with a specific mission; For the Son of Man came to seek and to save the lost (Luke 19:10; 1 Tim. 1:15). He accomplished redemption for his elect at Calvary, not when it is applied to them later in the ordo salutis. In other words, saying that Christ's sacrifice is sufficient for all moves (against Scripture) redemption to when it becomes efficient .... a time removed from the Cross. In other words, SFA confuses when redemption was "accomplished" and "applied."
Sorry, for the hurriedness of the reply; possible lack of clarity.