I wouldn't particularly count the right to vote as a real advantage.
The main advantages are the ease of travelling (no longer need visas to travel to a lot of places), and even if you decide at some point to go back and live in the Philippines for many years you could always easily return back to the UK and have access to any benefits (income support etc).
The advantages of getting it is as soon as possible is it won't get any cheaper or easier in the future.