I assume that you are a UK resident US citizen.
On the above assumption, as regards mutual funds, as is well known, you would wish to invest in-
- US domiciled funds, to meet US tax requirements,
- which have UK reporting status, to avoid being charged to income tax on gains on sales.
For UK purposes, a REIT is an investment company, based in the UK whose shares are listed on the Stock Exchange.
Perhaps you are using the term REIT to mean something else?