HI there , I have both types , and Aqua scan PI (Pulse Induction)the Vibratector and a Minelab Excalibur.
Before you decide which type of detector you need to look at what your looking for and where.
The Vibratector is a PI unit , its excellent for small search areas or areas with a lot of rock where you want to get into the crevices and where there is not a lot of junk as it does not discriminate.
Both the larger detectors are better for larger search areas , I prefer the minelab but they could improve the handle
Starting off I would go the the Vibratector .
Also worth noting that when your digging you burn air ,
Use a plastic garden trowel as you can pass it under the detector without setting it off ,
and good luck