I think this would depend a lot on how you are planning to use the kitchen and your lifestyle.
Hobs in Islands can be very effective. As if you also have a breakfast bar as part of the island then it can create a great social point for guests, as well as the chef, and means that no one is left out of conversation.
However you also need to consider how the hob will be extracted.
There are lots of options for Island hobs either ducted or recirculating, if you don't often cook a lot of strong smelling or greasy food, recirculating will be fine. But if you do you get a lot higher extraction rate from ducted, but the longer the air takes to get outside the worse it gets. So if this sounds more like how you will be using the kitchen I would suggested putting the hob against the outside wall so that the air is taken straight out of the kitchen.
You also need to think about how to get power/gas to the island. A suspended floor will be relatively straight forward, but a solid floor will be more problematic. Remember also you will need space either side of the hob to put pans down, utensils etc, so its not just a case of having a hob. Its a hob plus!!
Just finished our project and toyed with putting the hob or sink in the island - in the end I put them both against the wall and left the island as a work area. I didn't like the idea of kids/friends hovering over the cooking area and the pressure to keep clean/tidy would be too much. Just my personal opinion.
This is one of our recent designs that will hopefully help you in your decision, either way! The elevated breakfast bar makes the island a bit of a social space to cook without guests getting in the way! There's also deep storage drawers underneath for pots, pans and other cooking bits and pieces. The sink is right behind the island, as is the fridge/freezer and the wall-mounted ovens, creating a good kitchen work triangle between the island and the back wall of the kitchen.
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