I have been shooting for a long time but my experience with telescopic scopes is very limited. I just got a 16” car model and I want to add a scope. I don’t want to break the bank, due to the fact that I am a college student on a limited budget. I looked on cdnn investments out of Texas. They have a scope that mounts on the carry handle that is a 4x30, I know what that means the thing I am curious is Illuminated 2-Color Rangefinding Reticle. That scope is $54. then there is one for $15 more that 3-9x42 this one says Bullet Drop Compensator. What is the difference between the two, and is it worth it to spend the extra money on the 3-9 power scope? Any advice is going to be greatly appreciated.

Just to be safe here are the specs for each one
Brand New • 3-9x42 Rubberized Scope with P4 Lighted Reticle • Bullet Drop Compensator • Waterproof • Shockproof • Fogproof

and the cheaper one
Illuminated 2-Color Rangefinding Reticle • Rubber Armored • Carry Handle Mount • High Quality Sporting Scope • Sharp, Bright Field Of View • Great Power • Notrogen Filled and Fog-Proof • Fully Coated and Heavy Duty Recoil

My advice, don't mess around with inexpensive or cheap optics.  You get what you pay for here.  Save your money and go with a better quality scope.  The Leopold VariXII line might be a good starting point.  The Super Sniper scopes are nice as well.