Don't let the manual GB intimidate you. It is very easy to set and maintain. I will be happy to provide you with some tips on setting yours, if you decide to get one.
Both detectors operate in a very similar manner. Although the X-50 has two discrimination patterns and an all metal "short cut" button, the X-30 accomplishes the same thing with one pattern and an all metal mode. The X-30 has no separate "short cut" button. Quite honestly, I have found myself hunting in all metal and letting my ears and eyes sort out the trash. Both offer notches, but the X-50 segments are a bit "tighter". Both offer tones, but the X-50 has 4 tones opposed to the 3 tones of the X-30. With that said, I like the way the X-30 provides a high tone on all silver coins. The X-50 has some silver coins in the high tone category and some in the medium high tone category. The X-50's scale of 1-20 (as opposed to the X-30's 1-10) offers more "fine tuning" on both volume control and sensitivity.
As I said, both will hunt similarly, just different setups to get you there. Even so, I would chose the X-50 for three reasons.
1. The X-50 allows the implementation of different frequency coils. You may not currently have a need for the higher frequence 18.75 kHz coil. But who knows what may lie ahead in the way of accessory coils or what your future requirements may be?
2. The X-50 has manual ground balance. Depending on the site I have been hunting, I have had my X-50 Ground Balance set anywhere from 6 to 11. That don't sound like a lot of variance. But when it is not set properly, the detector will not respond as it does when the GB is set correctly for that site. Therefore, a fixed GB detector would not have provided the optimum setting for these sites.
3. The X-50 has a "noise cancel" feature that allows the user to switch the channel to one of three different settings. This may be an important feature if you are hunting in an area with radio frequency interference, AC interference or interference from another detector.
You won't be disappointed with either. But if the extra $ is not an issue, I think you will be glad you bought the X-50 for the reasons I have mentioned. HH Randy