Hi,
I own both, my BHID was upgraded with the Super 12 coil which is the same as the BHID 300.
Depth: The Infinium is the deepest detector I've ever used. I currently own a CZ20, BHID 12" coil, Infinium, CZ6A and Discovery 3300 (also owned a Sov and other machines too).
I find the BHID/12" coil setup to be as deep if not slightly more than the CZ20. You need to understand that the Infinium is a pulse machine and works best in the wet sand to deeper water. The discrimination does help but is not as accurate or easy to use as a VLF.
Discrimination: The Infinium has dual tones that help to identify the type of metal below. If you use the tones in combination with the reverse disc and iron check feature, you'll dig much less junk. This will all be easier after time is spent learning what the machine is telling you.
The BHID has a discrimination mode (multiple tones) with LEDs to help decide what's there. Now one of the best features is you can hunt in "all metal" mode and still have target ID using the lights (not many machines can do that)! I do find that between the LEDs and tones, I find the disc to be pretty accurate. This of course is taking the time to learn the machine and the different sounds.
Learning curve: The Infinium has a steeper learning curve over most machines. I wouldn't recommend it for a beginner as they might get frustrated during the learning process. If you're willing to get through the curve, it's an amazing machine if used in the proper environment (more on that later).
The BHID 300 as all machines has a learning curve too. However, It's not difficult and can be used right out of the box.
Coils: The BHID 300 like most water machines has one coil. The Infinium has multiple coils that can can be changed on the spot for various hunting conditions. This is a very nice feature that most water machines don't have.
The BHID Super 12" coil is fantastic on the beach. It has a fast sweep speed and quick recovery too. The coil can cover more area with the larger size and this means more targets to be found. The coil is very sensitive on small things and has good pinpointing. It's also a breeze to use in the water as it cuts through with little resistance.
Batteries: The Infinium has rechargeable batteries that you charge up the night before (no problems hunting all day).
The BHID uses alkaline batteries that seem to last and last (30-40hrs). White's does have a rechargeable pack available if you wanted, but not many use it because of the long alkaline life.
Detector environment: The BHID IMHO, is now my favorite all around beach and water detector. I grab this the most out of all machines I've listed.
I can hunt really fast between the wet and dry while scouting out potential areas to hunt. The BHID with the newer coil is also more stable when adjusted correctly in the water.
The Infinium is the machine I'll grab when hunting areas that have been pounded or sanded in. I might also prefer to use it if I'm going to be in the water as less junk is there and the good targets are deeper down.
You see, the Infinium being a PI, is more stable and can hunt tough black sand (if adjusted correctly) better than a VLF type detector!
I would not use the PI in fresh water unless it's a pounded out location and the targets are scarce and deep. Rusted old iron just doesn't dissolve in fresh water like it does in salt. This is why I would recommend using a VLF type machine for fresh water hunting.
This is the reason I use both types of machines. They work well together as a team and all bases are covered.
I would pick the BHID 300 as an all around detector if you want to go all over the beach.
I would pick the Infinium if the hunting is going to be in the deeper salt water.
Good luck in your decision with any brand or model you choose!!!
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