Some managers claim SA does not work, or not as much as it ‘cost’. And I have to say that is totally misleading.
The following would be based on vs similar or weaker opponents, with my own experience from matches in bracket. Examples:
A) AMs with ’Shadow Striker’ scores loads of long shots, and they tend to ‘push back’ the defender when vs the last defender, then scores from range (They are more likely to take first-time long shots for direct goals as well when others will opt for another pass)
B) Any of ST/AM with ‘FK Specialist’ scores more freekicks (Please note that single-position ST as freekick taker may result in a huge drop in assist in set-piece rate, as their crossing value is generally low) - Best to be at least ST/AML(R)[+AMC/ML(R)] as left and right freekick taker
C) AML, AMR, ML or MR as ‘Corner Specialist’ seems useful - DL or DR is difficult to train as drills with crossing always come with shooting (wasting conditions) or heading (wasting unless also as DC, who should then get ‘Aerial Defender’ instead)
D) ‘One-on-One’ under ST only works very well in specific circumstances, such as formations like 4-1-4-1 or 4-1-3-1-1, ST having very good speed stat and team playing counter.
The rest are well documented and have other threads explaining as well.
We all have our own way of setup, so SA choice to complement our team is very much dependent on our style of play. For me, buying players should look at multi-position first, and I would rather there is no SA and spend some 50-60 packs to train to suit my team for at least 7 seasons. Having a multi-position plus a perfect SA for the team would just be an icing on the cake (Usually that comes with a hefty token cost, so not really an attractive auction to win).
Winning is a form of art. Consistently winning is a show-hand of skills and luck.