Will...

Being a newbie, I don't know what you mean by a chain mortiser being more versatile. Would greatly appreciate additional comments.

One person suggested that since my timber framing may be limited to 3 or so buildings, that a chisel mortiser would be of more value to me for things such as building decks, large indoor/outdoor furniture... What do you think?

Any comments on whether a chain or chisel mortiser would be easiest on a bad right should of a right handed person? I have reasonably good strenth, but can not raise the arm above shoulder height. Swinging a mallet vertically is a bit of a challenge. but I can do it in moderation. Horizontal swings are easier for me. Consider me determined and passonate about TF...I know I'm not the best candidate. But I'm going to do it anyway! (Hobby, not as a business.)

Joel