It really depends on your interests as the said shows are nothing alike. They’re both awesome, with great characters but one is about a gang family in 1920s Birmingham and one is about a genius younger who hatches a plan to break his brother out of prison in 2005 Chicago. Personally I prefer prison break as it is action-packed, exciting and has some of the best characters on TV. Peaky blinders is consistent with its quality and writing but the first 2 seasons of prison break are better than any season of peaky blinders. Despite this, peaky blinders maintains its high quality from start to finish and is just as gripping. I’d suggest if u want something different with complicated plots, go for peaky. If you want an exciting show with charming characters and an unmatched first 2 seasons, go prison break. Not to mention it came out in 2005 before breaking bad and GOT so it was very much the first of its kind which I respect all the more. To conclude, watch trailers to them both and if u want something more complicated and mature go for peaky, if you want something action-heavy and easy to watch, go prison break.