The Coinstrike is probably not a good choice if you are new to detecting, you may grow very frustrated. The CZ's & ML Explorers are pretty widely noted as being the deepest VLF coin detectors on the planet. You'll see some debates about it, but I think you'll find broad usage patterns are the bottom line about it. But when you get down to the ultimate depths at the limits of detection, experience begins to count for eking out the last inch or two. Both the Coinstrike and CZ have small coils for trash usage as does the Edge.
For a newbie I think the Edge would be ideal. Lightweight, excellent ID at depth, can be used almost as a turn on & go right from the start. Then as you become more comfortable notching and varying the adjustments can be experimented with. But the adjustments are not as complex as the Coinstrike so you have less chance of mis-adjustment and not wondering if one adjustment is off.
I may get some debate from other Fisher users here, but the Edge with small coil in trash is hard to beat. It's big advantage is seeing the continuous ID of rejected targets when in iron.
HH
BarnacleBill