Das ist eigentlich so wie auch auf Deutsch :
XY is a suitable measure to increase productivity - ... ist eine geeignete Maßnahme, ... zu erhöhen/steigern.
XY is suited to increase productivity - ... ist geeignet ... zu erhöhen/steigern.

I'm not sure either is really the best choice here. It seems to me that something that increases productivity would be better described as useful, helpful, valuable, effective, etc.

XY is likely to increase/improve productivity.
XY will be good for productivity.

Suitable and suited both have more the sense of appropriate, fitting; maybe something like passend, angebracht, angemessen ...?

Note that the two adjectives are used with different prepositions, but that both take a noun or gerund, not an infinitive:

suitable for __________ing
(well) suited to __________ing

These shoes are not suitable for hiking.
These shoes are not well suited to rocky terrain.
Tailored, conservative attire is suitable for business.
Tailored, conservative attire is well suited to working in a traditional office.

related discussion: Das leidige Gerundium