You're comparing a youth global pass with an adult German rail pass. You can only use a youth pass if you're not yet 28 at the first day of validity.
The German rail pass should be cheaper than the 10-day global pass. You can use the German rail pass from Brussels or Liège if you use the ICE.
If you have a non-European passport, then you can choose whether you buy Eurail or Interrail. The price is the same, it's just that Interrail global passes have a maximum of 2 travel days in your country of residence, so Eurail would then be more interesting to you.
You can use Eurail if you have a non-European passport.
You can use Interrail if you live in Europe as long as you have a valid residence permit.
Be aware that you've posted Global Youth and One-country Adult prices. Both are available in Adult/Youth versions.
The One-country Youth pass for 5 days costs 187€.
The German Rail Pass is somewhat different than other One-country passes as it includes some international trains :
- ICE from Brussels, Liège to Germany (not Eurostar trains)
- EC from Munich to Verona, Bologna, Venice
Eurail is for those from outside Europe
Interrail is for those from Europe
The main difference is Interrail has limit of 2 days use in home country.
With non European Passport you can get Eurail, be sure to correctly use the country of passport when ordering.
Right now there is a 25% discount on the Global Pass that you are looking at and a 10% discount on the German Rail Pass. Then, as said above, you are also comparing a youth pass with an adult pass.
My bad. Thanks for pointing it out. I really appreciate all the helpful suggestions here!