I have an Omega set too. Electric 90mm oven and 5hob gas range. Omega is made by Smeg but is their cheaper range. I cannot speak highly enough of it.
I originally wanted free standing but this one is under bench and is the best oven I have ever used. I love love love it.
The benefit of having separate is that you can have them separated if you want ie oven under a bench and cooktop on an island if you so desire (next kitchen I build will be like that).
I would never opt to have under 90mm again as none of my trays fit.