I switched to Laya earlier this year from Aviva. My new plan was supposed to be identical re benefits. However, I've just had major surgery, and Laya would only pay the (lower) cost of the procedure to be done in the private hospital, rather than the (still privately charged) higher cost in the associated public hospital. This had implications for my treatment options, as the surgeon was concerned that I might need ICU after op, and had it not been for the generous covering of extra costs by SVPH themselves, things could have been very critical, perhaps resulting in an emergency operation via A&E.
If you're not too concerned about possibility of requiring scheduled surgery, all else is like for like with Aviva Level 2 Hospital, or was at time of renewal/switch in May. My plan is Healthwise Plus (no excess), by the way. You won't find it advertised, you have to ask for it. If still available, it is significantly cheaper than any other comparable option.