My first metalworking investment was a PRAZI lathe with the milling
attachment. Used it for several years before advanced to an EMCO lathe
with milling head, then a mill/drill.

The lathe/mill adapter is very limited in how big a part it can mill.
Also, not very rigid. But it does get you going. Since both of the
attachments you ask about attach to the cross slide on your lathe, you
can determine the maximum length of a pass you can make.

How do you intend to hold the end-mill? Do you have a collet setup for
the lathe? If you are going to use small end-mills, the maximum speed
of the lathe may be a little slow.

Good luck! Paul