Closer to breast because babies prefer it that way
Having a teat on your bottle that closely mimics your breast is likely to help your baby accept the teat. Tommee Tippee teats are most breast-like in shape and allow movement so baby is more likely to accept.
Once you have tried all the above and more you may be tempted to keep trying different bottles and teats until your baby accepts one. Each time you try a bottle your baby gets a little more comfortable with it. Assuming you’ve tried all the above, 6 tries of the same bottle is likely to be as successful as trying 6 different bottles. So save your pennies and persevere with the bottle you think is closest to breast in shape and movement.