Breast implants with fat transfer to reach desired size or just bigger implants?

If you have a desired size then you and your surgeon should choose the implant with a goal to achieve this size. Fat transfer is unpredictable and often requires multiple treatments. Generally, fat transfer in tandem with breast implants is used as a way to create closer cleavage or soften the look of implants to be more "natural". It is not a reliable way to increase size for most patients, unless they have abundant financial and time resources to have multiple procedures. Of course, this is a generalised answer and there would be many questions your plastic surgeon would want to ask you to determine the best plan for you.

Hello!
If you have a specific size you are going for, then a fuller implant is a better bet than implants + fat. Implants are far more predictable.
If you are interested in liposuction of another body region - like the abdomen or back - then you can definitely recycle the fat into the breast and not waste it.
As far as costs, in my practice fat transfer costs more because of the time and effort placed into liposuction to provide the fat. Placing implants - while there is a cost to the implant - is less expensive because it takes less time.
I would recommend you meet with a board certified plastic surgeon to discuss your options. You can find one at plasticsurgery.org.
Best of luck to you!