Splinted crowns or individual crowns, what issues should I be concerned with when getting them?

No implants, have just been recommended that my upper and lower front teeth be crowned with Zicornia preminum and that they, all upper and lower be attached (splinted) to each other. My teeth are functioning well just the veneers were cracked. I am not sure if it is splinted crowns or seperate crowns that are better in my case. I understand there are several issues to be concerned about, cleaning, maintenance, problems with just one tooth down the line. Your advice would be most welcomed