See, it's tempting to put Guerrero #1. It seems like a complete homer move since Soto has been an offensive monster since 2018 and Acuna and Tatis are incredible two-way players, but Vladdy right now is performing at a level that none of the other three have ever reached over the long term. Perhaps within a season one of them has, I haven't checked.
Basically, he may be significantly better than both Tatis and Acuna offensively and with his re-found athleticism and surprising defensive prowess at 1B the gap in secondary skills may be smaller than people think.
Vlad right now: 4.1 fWAR, on 150 game pace for 9.76 fWAR
Soto: 4.9 fWAR in best season (2019), 7.66 fWAR in 2020 projected out to 150 games
Acuna: 5.6 fWAR in bet season (2019), 7.83 fWAR in 2020 projected out to 150 games
Tatis: 150 game extrapolated fWARS are 7.65 (2021) 7.37 (2020) 6.42 (2019)