It's nice to be able to burn coal too so I'd opt for a multi-fuel stove rather than just a wood burner unless you have an endless supply of logs. Important to correctly size the boiler too (as you would with rads) as you can have too large a burner that'll overheat the room.
Tbh stove technology hasn't moved on that much imo, there are a lot of claims about secondary burn efficiency but in the end it's only a box with a grate and a few vents. My stove is an Aarrow Acorn five and it's just as efficient as Aarrows' Defra approved Ecoburn version except it hasn't been sent off for approval and costs £200 less. If you're looking for multifuel and around 4-5kw I'd recommend it but they are fairly small and you'd have to cut the logs accordingly.