what is better Freightliner or Spartan

Try to drive both and see what you like better. Avoid getting caught up in marketing catch lines. Drive them in town, over speed bumps in a parking lot, up and down hills, in a wind if you can, make quick simulated corrections etc. both will have different behaviours in these conditions. Pick what YOU like better, not what somebody says is better. I get to drive lots of different chassis and have found some chassis are nicer to drive than others but maybe have some undesirable quirks in some situations. For example, many like IFS (independant front suspension). I prefer solid beam but sometimes prefer IFS in city situations. My neighbour is just the opposite. Point is, get what you like.