In my opinion a baitcaster is better for heavier bait and heavier line applications while spinning gear is better suited to light line techniques like shaky head and drop shot or casting the smallest of crankbaits.
I use a baitcasters to cast all my Texas-rigged plastics even using a weight down to 1/8oz. I feel I have better control of the bait during the cast and more control over the fish after it’s hooked.
That doesn’t mean a baitcaster is better then a spinning combo - a friend of mine only uses spinning gear for all techniques and does quite well.
As for the bird nest - tie your most often used weight of lure on the line. Tighten the tension knob (right under the reel handle) all the way tight. Hold the up toward the 11 o’clock position and press the release button. The lure should not fall. Now slowly start releasing the tension on the tension knob. When the lure starts to slowly fall don’t turn the knob anymore. the lure should hit the floor and not birds nest.
The next step is to practice, practice, practice.