First, 70 walks is 70 bases. That's kind of a big deal. The reason wRC+ exists is to make these things easier to glance at and see who is demonstrably better, even when certain counting stats are similar.
Since 2018, Soto's wRC+ is 158. Since Vlad joined the league, Vlad's wRC+ is 136. 22 points of wRC+ is significant.
As is the bSr difference of -8.6 for Soto's career vs -13.6 for Vlads. Not a major difference there, but still a difference.
Defense... Soto -49.2, Vlad -90. Kind of a big deal.
I get that these types of mega deals probably don't get too much into the weeds of defense and baserunning, but ... even just at a glance, Soto is clearly a better hitter, runs the bases better, and is worth more defensively. The differences between the two players cannot simply be boiled down to "The only difference is 70 walks."
BTW, since 2018, Soto is #2 in all of MLB in wRC+ behind only Judge, whos also better than Soto defensively and in baserunning.
Then... there's fWAR. Exact same time frame for WAR, which will slightly penalize Vlad since he has about 120 less games played than Soto and a few others in the leaderboard, Soto still ranks top 5 at 35.8 fWAR. Vlad???? 40th at 15.9. Right behind Vlad? Whit Merrifield at 15.8. Even adding on 120 games worth for Vlad's averages would put him around 25th... or so.
So, Soto #2 and #5 in wRC+ and fWAR.
Vlad... #10 and #40.
"The only difference is 70 walks."