Personally, Im traditionally a top to bottom, left to right kind of stitcher. Its what makes sense to me.
But Ive seen lots of people start in the middle, and even more stitch from the bottom of the pattern to the top.
For me it depends on the chart. If it was a HAED or a full coverage chart I would start at the top left. Most kits I start in the middle.
It just depends on how complicated it is. Most cases I start in the middle. I think starting from the bottom would lead to wearing of the
stitches already stitched. So I usually start in the middle work up and across then down to the bottom allowing the stitches done to be rolled under my frame or hoop.
When I stitch a Heaven and Earth, I do a full x before moving on to the next stitch. When I used to do a plonk load of Mirabilia, I would do the /////// then \\\\\ method. But still, always left to right top to down.
Someone once started me in the middle and it was a clusterfart of confusion for me.