"Which is better"
I think mas maganda if mag base ka which one yung mas kabisado mo.
Meron din tinatawag na asynchronous in both rust and python.
Para kalang nag compare if gagawa ka muna nang madrtilyu bago ka mag papanday or bibili ka nalang.
If familiar ka po sa "python" madali lang yung fastapi chaka yung frontend di naman mandatory na gagamit ka nang JavaScript usually html/css or modern version: tailwind css/ htmx with ajax.