Mac without a doubt (even if the wifi in the T5 lounges has occasionally not let mine log on!... although admittedly this was a fault on BAs side)

The Air is the one I try and carry with me... it is slower than the others but so portable, and the 17'' Mac Book Pro I tend to leave at home, or take with me only if I need to burn DVDs on the road or use film editing software etc.

When I get home, they connect beautifully to the 30'' HD monitor (which is a dream) and to the airport base station / time machine which handles any backups of changed files automatically, so the next time I leave the house I know if the laptops get nicked, everything is safe.

Yes, you'll keep on upgrading and spending money, but coming home with new Mac gear in its gorgeous packaging is like carrying haute couture