two of my friends workout alot and I'm wondering who's building more strength?

1.190 pound friend is doing about 5 dips with a quick pace, while my 120 pound friend in doing 15 dips with a slow pace who's building more tricep strength

2.the 190 pound friend is doing dumbell curls with 60 pounds, while the 120 pound friend is doing 18 chin ups who's build more bicep strength


please give reasons why