It absolutely betters your chances.
In the 75th, Pre-Ranger is mandatory. Not so you can get your tab, but so you can get your tab fast and without recycling phases a whole lot... your platoon needs you training for deployment, not messing with knots during mountains for 2 months because you keep recycling.
Almost all infantry units have pre-ranger courses, but none are as brutal and infamous as the 75th Pre-Ranger course. I thought it was worse than RIP, and I was glad to finally get to Ranger School. Pre-Ranger to me is the shittiest course I have ever done.
I love my warm bed and dry clothes.