I inherited an Avent electric steriliser and find it a lot less hassle than the microwave one I use at Granny and Grandad's house. Although it's not as easy to hide away, there's less measuring water and all I do is flick a button to set it going.
Things I would think about when buying a steriliser:
1) Space - is there space in my kitchen for an electric steriliser to be out on the side, or should I hide one away in my microwave?
2) Is my microwave the right size for a microwave steamer?
3) What brand bottles am I going to use? We were given some Tommee Tippee bottles which I struggle to fit into our Avent steriliser.
4) How many bottles am I going to sterilise at once - I find the electric steriliser easier to arrange a greater number of bottles than the microwave one.