Is FUE or FUT better for lowering my hairline to minimize how big my forehead looks? (Photo)

You can get an excellent result with either of the techniques. There is actually no difference in the results, only in the donor site. The most important factor is the skill and experience of those doing the work. The micro-grafts must be single hair grafts for the hairline, and they must be angled forward just right. Ask to see photos of who you choose.
Your hairline can definitely be lowered, but it must be done properly to look completely natural.
Thank you for your question, and best of luck to you.

Hair transplant can be an option for forehead reduction and correcting  asymmetry on your frontal hair line/forelock.I advice you have a FUE; you would get the desired hairline in just one sesssion of dense packing hair transplant. During the placement of follicular units there will be a mixture of single, double and a few triple grafts, which help to create the soft look of a natural hairline. For the first few lines always go for single grafts, later doubles Triples and others.So that a smooth transition will be there giving undetectable hair transplants.they are very tiny and invisible scars of punch insertions in FUE tech. . Actually I have no complaint about those scars before… But you would have a long, 2-4 mm widht pretty visible scar on back of your head in FUT technique (which I never use that technique any more) , because doctor has to cut your skin to harvest a strip of skin as a source of grafts and suture this skin gap to close .