If you're a raw beginner, and if you're not looking for tiny specks of gold, the Fisher Gold Bug Pro has an easy learning curve, and it hits hard on bedrock gold, does well along stream banks, but is not waterproof, but is up to the control box. Found lots of sassy nuggets with it, nice and light, can swing it all day.
The Minelab Gold Monster also has an easy learning curve, hits hard on bedrock gold, works well at sniffing out shallow gold, light and easy to use, simple display that lets you know when there's a good chance of conductive metal under the coil.
Going along with the ability to punch through extreme mineralization with a Pulse machine goes the higher price, and they're heavier than the highly specialized VLF gold machines.
The Gold Bug 2 is an older platform, but still highly capable, but a steeper learning curve for a beginner.
The other thing you need to consider is how large are the pieces of gold in your area. If they're all tiny specks, you'll need a higher frequency VLF/multi-frequency and a small/smaller coil. So, what's the gold size like where you're prospecting? If it's tiny stuff, that's a high value determining factor on which machine you choose.
I love the Equinox 800, but it has a higher learning curve than the Gold Bug Pro or the Gold Monster.
So, if you have gold that has any size, and as you're a raw beginner with detectors, I'd go for an easier learning curve to get started, then once you've got a nice catch of gold, you can tackle the machines with the higher learning curves and/or the steeper prices.
Here's the key that most beginning nugget hunters miss--you need to dedicate long, long hours to specifically nugget hunting only. As well, unless you're extremely lucky or hit a fluke nugget right off, you'll dig buckets and buckets of trash before you get that first nugget, but if you're constantly referencing your detector manual/online tutoring/YouTube videos and you are constantly refining your techniques in the field, all while you fail over and over again, you'll gradually get good at finding gold. Most people just don't realize all the things your head needs to learn to find gold or the patience required to find nuggets with a metal detector.
In summary, if you're not just after tiny gold and don't want a steeper learning curve, I'd go with the Gold Bug Pro or the Gold Monster 1000 if I was just starting out. Neither machine will overwhelm you, and they'll both hit hard on shallower gold.
All the best,
Lanny