(iPhone+Android Tab)/(iPad+Android Smartphone)?

Currently i am out in the market looking for a smartphone, tablet combo. I would really like one of the devices to be Android and other running iOS, kind of a best of both worlds feel. Going through all what is out there, i am confused whether to go for (iPhone+Android tablet) or (iPad+Android Smartphone). I don't mind either combo but would really love to hear some suggestions first. Pricing is not really an issue, but i will be invested into it for a long time so something a little future proof will be preferred.