Arsenal would make a good choice by signing Arthur and Tielemans both. But I believe that they should be focusing on signing especially Tielemans. Because Tielemans' performance at Leicester has been very fascinating until now. He has already drawn the attention of big clubs undoubtedly. Considering this point, Arsenal would make a great addition if they sign him. And as for Arthur, I haven't liked him so far. And I don't know if he can start playing better in case he comes to Arsenal.