It depends on what you want.
A couple of clarifying questions:
* Do you want to use the radio as an alarm clock as well?
* Do you want to listen through the speaker, or through headphones, or both?
Also note that many models now use lithium-ion batteries. You'll have to put a radio using lithium-ion batteries in carry-on luggage.
One more thing to note: AM radio is dead in much of Europe. No AM stations at all in France or Germany; in the Netherlands, there's low-power AM (10 or 100 watts) run generally by hobbyists. Spain still has some stations on the medium-wave band. So I would prioritize FM reception.
I can't tell you much about DAB; it appears widely available but I've never had a DAB radio. I may buy one the next time I go. I've done some searching on Amazon France which, unfortunately, just like Amazon U.S., is cluttered with "brands" that have obscure names. I might just go to an independent shop, depending on the country I would be in.
What I have found to be very good performers:
* Tecsun PL-320. Uses a BL-5C lithium-ion battery (supplied); charges with a USB-C port. Excellent FM reception and you can set the reception range easily. You can set up to two alarms. Has an easy-to-use memory system plus "Easy Tuning Mode" which is a second, separate memory system that I've found to be great for use when traveling. Better sounding speaker than older Tecsuns. The PL-330 is similar but, in my opinion, the '320 is preferable for FM use.
* Qodosen DX-286. Uses an 18650 lithium-ion battery (not supplied); charges with a USB micro port. Just a hair less sensitive than the PL-320 on FM. Can easily set FM bandwidth and de-emphasis for Europe - 50 µs compared to 75 µs for North America. DXers are raving about this one, but those sentiments have largely been oriented toward AM and I think there's a bit of hype involved, too. Speaker sounds good. Has an RDBS/RDS readout, which is nice to have. One alarm setting. Quirky ergonomics, especially with regard to storing stations in memory. Even though a new model, still uses a USB micro port rather than USB-C.
* Sangean DT-250. This is the "rest of the world" version of the DT-400W. No weather band, which is not needed outside North America, and is set for 50 µs de-emphasis. I got mine from Amazon France. Uses 2 AA batteries and has a small speaker. Has bass boost for headphone use. Very good on FM but the antenna is either the headphone cord or a separate wire that's supplied. Thus, it doesn't perform quite as well on FM as the first two. Nineteen memory choices. No alarms.
* Sangean DT-800. This is not the same version sold in North America; I got mine in France. This can be ordered from Amazon France, coming in either white or black. If you see a yellow one, you'll know that it's a North American version, which you don't want for Europe. The "rest of the world" version also does not have the weather band, similar to the DT-250. Supports RDS and is set for 50 µs de-emphasis. Two FM bandwidths. Very good on FM but the antenna is either the headphone cord or a separate wire that's supplied. Thus, it doesn't perform quite as well on FM as the first two. Twenty memory choices. No alarms. Uses 2 AA batteries, which can be rechargeable ones via a USB micro port.
Here's hoping that this is helpful for you!