Depends on the size of the island and what you want to use it for.
sink on the island is good for prep, but bad for drying pans etc and you have to put them away asap or it’s cluttered.
hob on the island is good as it’s social, but you have to turn and cross the gap to drain hot water from pans and you have to work out your ventilation.
a huge island- 3.5m+ with both could be a solution, but who’s got the space?
nothing on the island and you risk it being a dumping ground for stuff you’ll get around to later.
how do you work in the kitchen, what are your maintanence habits and what would suit you?
we went for a hob on the 2.4m x 1.2m island, it’s to one side giving 1.2m of space for an L shape configuration of stools the other end/side. This is adequate prep space and makes it easy to share prep too. I knew we would leave drying things around the sink, so we have a wall mounted drying rack from ikea to stop the clutter spilling on to work surfaces and I love it. Couldn’t have that on an island, which was the decider for us. Sink is on counter behind the hob but off to one side, 1.15m of walkway space between the two. I don’t love crossing over to drain pots but there’s space all round the island so we rarely get someone needing to be in that space as I’m using it. We have a wall vent which suits regs, rather than an island-based extractor and hob is dual fuel with only one gas burner so don’t need the extraction feature for gas.
just think about the reality of how you work and want the space to feel and don’t get seduced by beautiful Instagram/Pinterest pics.