I've had Nokia, Sony Ericsson, Samsung and Apple. I switched between Nokia and SE for a while, left Nokia completely in 2010 after having a N8 for a month, then I left SE after having a Xperia X10i for about a year and a bit.
I've had the Samsung Galaxy S2, S3 and S4 and I plan on getting a Note 4 later this year. I've also had a Galaxy Tab10.1, Apple iPad 1 and now Apple iPad 4, I plan on getting an iPad Air 2 later this year or next year.
I jump to whatever brand attracts me, in the past Nokia and SE were my choices, now its Samsung and Apple, in a few years time who knows? LG had my attention with the G2 last year and G Pro 2 early this year, but I'm still skeptical and I am very happy with my Samsung+Apple combo.