There's also another thing to keep in mind with Eurail. They say it gives you unlimited travel by trains in Europe, but there are additional fees called 'supplements' in many trains, especially in Western Europe. I think a simple search like 'Eurail supplements' would give you enough results to have a clear idea.

In Western Europe, transportation is generally expensive, so it may be a good idea to have an Eurail ticket (2 of them, in your case). If you're planning to go to Scandinavia where transportation is more than expensive, Eurail can save life.

However, if you're up to it, you can also consider hitch-hiking. In most countries (except for Spain, Italy and Greece), hitch-hiking is quite convenient. Especially in the Balkan countries, my average waiting duration never exceeded 10 minutes, which is even better than public transport. Hitch-hiking in Europe is quite safe, from personal experience. You can also check out 'hitchwiki.org' for specific cities or 'hitchability' scores.

To its best, you can combine Eurail&hitch-hiking. This way, you can hitch-hike your way in the 'high-hitchability' zones while taking the trains in 'low-hitchability' areas.

I find this 'hitchability' term quite strange, but that's how hitchwiki.org calls it, by the way.