Short Answer: In the end we don't know. Let's look to scripture though.
Isaac’s wealth:
Genesis 26:13-14 - The man began to prosper, and continued prospering
until he became very prosperous; 14 for he had possessions of flocks
and possessions of herds and a great number of servants. So the
Philistines envied him.
Isaac himself became very wealthy. He had many flocks, herds, and servants.
Jacob and Esau:
Jacob obtained the birthright from Esau in Genesis 25:31-33:
31 But Jacob said, “Sell me your birthright as of this day.”
32 And Esau said, “Look, I am about to die; so what is this birthright
to me?”
33 Then Jacob said, “Swear to me as of this day.”
So he swore to him, and sold his birthright to Jacob.
Jacob also received his father’s spiritual blessings (Genesis 27:27-29; 28:3-4).
And he came near and kissed him; and he smelled the smell of his
clothing, and blessed him...
However, scripture says that Jacob fled from his home. It mentions that perhaps he only had his staff (Genesis 32:10).
10 I am not worthy of the least of all the mercies and of all the
truth which You have shown Your servant; for I crossed over this
Jordan with my staff, and now I have become two companies.
By the time he returned, he had acquired great wealth in Paddan-Aram (Genesis 30:43).
43 Thus the man became exceedingly prosperous, and had large flocks,
female and male servants, and camels and donkeys.
Esau’s wealth: Esau also appears to have been wealthy. We read in Genesis 33:9, Esau tells Jacob: “But Esau said, “I have enough, my brother; keep what you have for yourself.”
Conclusion:
In the end we don't know. The Bible does not explicitly state who inherited Isaac’s wealth. However, it is likely that both Jacob and Esau received portions of it. Jacob’s acquisition of the birthright and blessings would have given him a significant share, but Esau’s wealth might indicate that he also received a substantial inheritance.
If this be the case, then it seems that both Jacob and Esau ended up with portions of Isaac’s wealth. Jacob’s wealth grew significantly during his time in Paddan-Aram, while Esau also maintained considerable wealth.