EUNE is the value pick in Europe. It prices about ten percent under EUW for an account with identical specs, and if your goal is a second or third smurf rather than a main, that difference adds up quickly. The ladder is smaller than EUW's but far from empty — queues are healthy through European evening hours.
It is also the shard we recommend to people who want to practise something uncomfortable. A new role, a champion you have never touched, jungle for the first time: EUNE's brackets are more forgiving than EUW's at equivalent ranks, so the learning games are less punishing. Buy an Unranked Smurf, play your ten normals on the thing you are bad at, then take placements once it clicks.