We used both at university, for designing UI and corresponding events Borland's dev studio was easily 10x faster to design if your UI was a bit more complex, especially if you are not very familiar with whole ecosystem.
MS design of their stuff in those years was often... shitty on multiple levels to be polite, ie MFC comes to mind, over-complicated for no good benefit. People jumped to literally anything else if they could, be it Borland for C/C++, Java had much saner object-oriented design model too (which could be compiled to native code with native UI if needed, since their default stuff didn't look the best).
MS design of their stuff in those years was often... shitty on multiple levels to be polite, ie MFC comes to mind, over-complicated for no good benefit. People jumped to literally anything else if they could, be it Borland for C/C++, Java had much saner object-oriented design model too (which could be compiled to native code with native UI if needed, since their default stuff didn't look the best).