In Jain philosophy, the ultimate reality is neither purely nirguṇa nor saguna in the same way as some other Indian systems describe Brahman.

More precisely:

• Jīva and ajīva are real substances in Jainism.
• A siddha jīva is formless, bodiless, and beyond worldly attributes like color, smell, taste, and touch.
• But Jainism does not say the highest reality is a single creator God who is nirguṇa in the Vedantic sense.
• The liberated soul is free from karma and worldly qualities, so in that sense it is nirguṇa with respect to material attributes.
• At the same time, it is said to possess infinite pure qualities such as:

So, in Jainism:

• Ultimate liberated state is formless and beyond material attributes
• But it is not attribute-less in an absolute sense, because the soul has pure, eternal qualities

Therefore, the best Jain answer is:

Jainism does not frame ultimate reality as simply nirguṇa or saguna; the liberated soul is beyond physical attributes yet endowed with infinite pure spiritual qualities.

If you want, I can also explain this in terms of Dravya, Guna, and Paryāya in Jain philosophy.