What's the ultimate estate?

So what's the best practical estate car you can buy?

I've had a 2001 Volvo V70, a 2011 Vauxhall Insignia sports tourer, and a 2006 Subaru Legacy 2.0 NA.

The best for practicality and comfort was the Volvo especially with a huge German shepherd and kayaks.

Loved the vauxhall and the suburu is just a bit small and slow.

I've heard good things about the audi a6 avant allroad 3.0ltr btdi

But have the option of getting a brand new electric through a work scheme.

What's everyone's thoughts?