Regarding to mem upgrade on DS1522+

Synology nas ds1522+ should i get 2 16gb stick or one 32gb stick in regarding dual channel.
Is there any performance gain with 2 16gb sticks?

For example tog get is:

Kingston Server Premier 32GB 2666MT/s DDR4 ECC CL19 SODIMM 2Rx8 Micron F Server Memory - KSM26SED8/32MF