ILR can be lost if you spend too much time out of the UK, which citizenship wouldn't be. Might not be an issue for you.
Entitlement to benefits is something else that I believe might be different if you have citizenship rather than ILR. Again might not be an issue for you but...
Bear in mind that the government doesn't like people remaining in the UK on ILR so things may change over time to make it more beneficial to have citizenship rather than ILR.