Is it safer for a country to have many different allies or to rely on one very powerful relationship?

In my opinion, having different allies is a safer option than rely on one very power relationship because, what if your only ally goes on a radical shift in domestic politics? The country who only rely on the powerful ally would be vulnerable to attacks from other country.

A country with multiple allies ensure that if its' ally collapses, your country wont be fully vulnerable to attacks while if you only rely on one powerful ally, you will be vulnerable to attacks. A country with multiple allies also makes rival powers to think twice before attacking your country because it might offend the other allies you maintain relationship with. This makes your country a less prone to heavy attack from rivals. Another reason is if you only rely on one powerful ally, what if their economies were to sink? Your economy will also likely to sink.

In conclusion, it is better option of having different allies rather than one very powerful ally because you have a lot of backup from your allies. You also wont feel isolated if you have a different argument.