there’s no need for you to apologise about your english! it’s bad enough that you have to learn english. never apologise for not being fluent in a language that isn’t your own – you can speak more languages than most people even bother trying to learn. nevertheless, your english is fine! :)
but, yeah. i think that charlie has got a strong voice, but only when he uses it for that kinda gritty tone, you know? like, imo, belieber for life does not show off his vocals well – he’s using them to mould into the ‘pop’ voice, but he needs different songs to strengthen his voice.
reece has got a strong voice but he is overshadowed by james, which is sad. but james does have an amazing voice. it’s quite boring that they do give him most of the solos, i agree – but i think most people would give him the most because he does have the technically best voice. i do think they (they being reece & james) should share the lead vocals, though – james doing the harder notes.
it’s sad that they don’t let tom sing more because he isn’t as strong, because his voice is really, really good, and it is unique. he brings something different. although i’m not the biggest fan of jake, it’s like him with his rapping – he needs to do that more, too. it’s different.
i do like barclay’s voice, but. i don’t think that it’s the strongest in the group. for me, james, reece, tom & maybe charlie have the 'stand-out’ voices.
i think chris & casey have the weakest voices. but casey does sing a lot more because of his image – look at 1d when they were on XF, for example. liam had the strongest voice and he had the most solos to start, but then harry started getting more and more because people liked him. and them now – harry & liam get the most, but zayn definitely has the strongest voice. he doesn’t have as many solos because he isn’t as popular. (btw, i’m not a fan of 1d anymore, but i think that they are a good example.) so they do base solos off of popularity rather than vocals, which you shouldn’t do if you want to get the best for the band.
but, yeah. they should share the solos out more.