Alogliptin? Sitagliptin?

https://www.nhs.uk/medicines/alogliptin/

I'm about to trial adding a second medication to the Metformin, for a 3 month period, to see if that improves things.
The doctor mentioned Alogliptin.

Previously, the nurse suggested Sitagliptin.
https://www.januvia.com/sitagliptin/what-is-januvia/
https://www.nhs.uk/medicines/sitagliptin/

Does anyone have any idea which is preferable, and if so why?

Both seem to ginger up the pancreas (from the NHS descriptions).

 

Noting that glyptins are DPP-4 inhibitors and the descriptions that I posted up top are a bit misleading (and confused me).
https://www.diabetes.org.uk/guide-t...lets-and-medication/dpp-4-inhibitors-gliptins
"
DPP-4 inhibitors work by blocking the action of DPP-4, an enzyme which destroys the hormone incretin.

Incretins help the body produce more insulin only when it is needed and reduce the amount of glucose being produced by the liver when it is not needed. These hormones are released throughout the day and levels are increased at meal times.
"

So it may reduce DP and make my insulin production last longer.
This sounds better than turning the wick up on my pancreas.