A longer loop that won't stress the connection. A lot of people seem to use the hoses. Can't say, mine is copper. I've got probably a loop 4-5 feet in diameter behind the frige so it easily allows the thing to be pulled out without a chance of kinking or stressing the connections.
You need to ensure the cut is square, you've got full diameter, and it is fully seated into the fitting. THen, it's a matter of getting it tight enough , but not too tight. Takes some finese, but normally, finger tight, then try about 1/2-turn. Then, maybe 1/4-turn at a time more until it doesn't leak.