The numbers show the Beal to Butler upgrade is clear

Beal

Net Rating: -8.6

Box+/-: -1.7

Vorp: 0.0

Player Impact Estimate: 8.9

Win Share: 1.0

WS per 48: .051

TS%: 57.9%

eFG%: 55.9%

Reb%: 6.0

Ast%: 15.9%

Tov%: 11.6

Free Throw rate: .165

% of shots 0-3 feet from the basket: .160

Usage: 22.6%

Butler

Net Rating: 3.0

Box+/-: 4.6

Vorp: 1.3

Player Impact Estimate: 13.7

Win Share: 3.8

WS per 48: .236

TS%: 63.8

eFG%: 56.5

Reb%: 9.3

Ast%: 24.7

Tov%: 8.2

Free Throw rate: .612

% of shots 0-3 feet from the basket: .361

Usage: 21%

Essentially we are getting improvements in all of our weaknesses. Rebound, Defense, taking care of the ball, Attacking the rim, needs the ball less, overall impacts the game more, and is a winner.