Personally, I think you looking at this the wrong way. I use REITs for income and as a way to diversify my portfolio - for me is like having a rental flat without the hassle. I think you said you keep quite a bit of cash in FD's? I am guessing that's fixed deposits? Why not compare overall returns on FD's to REITS? I, on the other hand, keep nothing in cash.
As you pointed out, it really does come down to circumstances - I retired on VERY little very, young at 40. Besides having to squeeze every last cent as income, I needed that income to be regular and to at least grow with inflation. REITS formed a part of that.
It comes down to :: dividends/yields are a function of the business and the wider economic situation. Share price, although partly a function on the business, is mainly set on the whims of the JSE - IMO. As my money has to last 40 - 50 years I opted to rely on the former - rightly or wrongly.
That said, variety is the spice of life, and have a smaller portfolio where dividend is not part of the equation so contains shares like Taste, trustco, Adapt, DSY and aspen. If I am going to fish, I might as well use a big net!
Personally, I will not get involved with your competition - the time line is to short and it's not about total gain but monthly income - so you need to decide on a yield you want before starting.