You don't need a finish nailer. An 18ga brad nailer would be more than okay and has a number of advantages.

• Smaller holes that need to be touched up.
• less likely to split the wood if too close to the edge.
• lighter weight gun
• less expensive gun if you want to go cordless

I replaced the trim in my entire house with an 18ga brad nailer and it has held up with zero issues for years of my kids slamming doors and bumping into things.

You might end up putting a few extra nails in compared to a 16ga, but the pros out way the cons.

You don't need a finish nailer. An 18ga brad nailer with 2" brad nails would be more than okay and has a number of advantages.

• Smaller holes that need to be touched up.
• less likely to split the wood if too close to the edge.
• lighter weight gun
• less expensive gun if you want to go cordless

I replaced the trim in my entire house with an 18ga brad nailer and it has held up with zero issues for years of my kids slamming doors and bumping into things.

You might end up putting a few extra nails in compared to a 16ga, but the pros out way the cons.