(US) Inheritance gained in subtrust, should I invest inside the trust or take it out and put in a brokerage account?

Family member passed away a year ago and it's a large amount of money.

I have full control over the subtrust and can withdraw or invest in it with whatever I want. The lawyer suggested I don't touch the account since its immune to creditor risk, but I was inform that the tax rate is insanely high for investments in trusts. It's something like 38%. The lawyer said I can shave gains off the top and transfer it to a personal account but that doesn't sound right to me, everything I looked up said you would just be taxed.

I just want to throw this money in an index fund and forget about it. Should I just empty the trust since I'm not worried about any crazy emergencies and invest in a personal brokerage account or should I do what the lawyer says? If nobody knows, would a fiduciary or a CPA be the person to talk to about tax on capital gains in a trust vs a normal brokerage?