I started with 2 piece rods. .
I used 2 piece because that's what I had as a kid so I did not know about one piece rods, Besides 2 piece rods were easy to store in a closet and in the car when we went fishing. I had 2 rods, a shakes piece 5 foot bait caster the the handle unscrewed from the rod and a Berkley cherrywood spinning rod that I had purchased (19,95 at Pascal's Hardware on Cote des Neiges in MTL).
When I started fishing again I went out and got 2 piece rods. Not cheap 30$ rods for me. The 60$ ones and I thought they were just great. Then I tried my friends one piece bass pro rod. What a difference.
I soon replaced the 2 piece rods with 100$ St Croix premiers, Wow they were great until I tried a St Croix tournament. I then got rid of the 100$ rods and started replacing them with 200$ rods.
I then picked up a couple of G.Loomis rods Bronzeback series. While I thought they were even better they were not that much better than what I had already had, I then started building my own rods all one piece, although I am building an ultra ultra light crappie rig that will be a 2 piece rod.
Rod Poll
For practical reasons (storage, transportation, less risk of breakage), most of my rods are 2-piecers. If sensitivity and feel are a concern, a one-piece will be a bit better, all other factors being equal. But design and materials make a much greater difference. And switching from mono to a nonstretch line brings a far greater gain in sensitivity than going one-piece does.