Without expansion, you can get to Level 31 buying stuff from vendors / RNG Drops. To get to 32, you'll need to run Crota's End raid (a lot of times!).
Level don't make that big a difference apart from Raid or Nightfall. PvP only affects Iron Banner but even then, it's still minimal.
The Expansion only adds new vendor specific items, additional bounties and the strike(s) and Missions. If the rotation happens to be a Expansion mission for the weekly update, then for a week, there's no weekly/Nightfall for non-expansion players. e: Also, you'll need the expansion for the new PvP maps and RoC strike playlist, which is the only list that now gives a Cryptarch engram drops.
All weapons that's available are available for non-expansion players too - apart from Raid Weapons / Armours.
Level don't make that big a difference apart from Raid or Nightfall. PvP only affects Iron Banner but even then, it's still minimal.
The Expansion only adds new vendor specific items, additional bounties and the strike(s) and Missions. If the rotation happens to be a Expansion mission for the weekly update, then for a week, there's no weekly/Nightfall for non-expansion players. e: Also, you'll need the expansion for the new PvP maps and RoC strike playlist, which is the only list that now gives a Cryptarch engram drops.
All weapons that's available are available for non-expansion players too - apart from Raid Weapons / Armours.