Best. mmmm several for different reasons - Nissan Primera SVE, just cos it was so well equipped, only really appreciating that in hindsigt.
Still got mine. I'd say it was my best car. Petrol 1.8 SVE SALOON - despite the disadvantage of a traditional boot, it has been a great car. Despite the very complex electronics, I've been able to sot simple fixes. It's been dead reliable, swallowed huge amounts of holiday kit, and 4 bikes on the roof. Not terribly economical (aero is massively affected by bikes on roof), but bloody quick for a normally aspirated 1.8 - easily red line it.
Bought the Primera in 2002, the car was just 10 months old (only been on the market 8 months - pre-release car) and saved a fortune.
Our second best has been my wife's Yaris - bought in new, just 6 months after they came out - it's 12 years old and still looks new - certainly confuses the mums at school - er your car is new - erm no, it's 12 years old !!! - But you all know what I'm like with my bikes.
Worse car, erm has to be a Rover Metro 1.4 GTa - only because folk liked to crash into it, and despite my fastidious cleaning, it started rusting after 4 years.... PX'ed it. It was fast as hell for a 21 year old though... just slightly slower than the bonkers GTi - it would easily out run Golf GTi's. But it was built like a go-kart. You don't crash them.
Worse reliability - company cars. First company car was a Vauxhall Vectra 2.5 V6 SRI - generally great - loved the engine - oh heck what a noise, but suffered a few engine faults, and body work was a bit rust prone.
Next was a brand new Alfa 147 Selespeed - got this as they were launched on the UK - top spec, paddle gear shifts - sex on wheels - 2.0 150 BHP. Electrical problems were a mare despite all the bits being Bosch - it was how the Italians put it together. Handled like on rails though - you couldn't make it skid - it was the only reason I stayed in the job I had -I got the car I wanted.... (PS the VECTRA and Alfa were in the point in my life that I didn't ride to work due to the distance) - I got sensible again after that.
My car now just has to swallow our stuff, and carry the bikes. The Yaris is brill for fuel efficiency, mine does the holiday stuff, so lack of fuel efficiency isn't a big problem, although it hates doing short drives now..fuel clog up etc ...
I'll keep our cars running a long time - I'd rather spend £6k on a bike ! Wife might be not too happy though.