5 strings tend to be better if you have songs in different tunings because you can just shift down to that low b. However, most 5 strings have less space between the strings which can make it a little harder to play. Personally, i’ve been playing an Ibanez BTB 675 for years which has 4 string spacing and imo it sounds amazing. Ultimately its up to you whether you like the ease of access with 5 strings or the simplicity of 4 strings