From Jain Dharma point of view, this question has two different angles:

1. Spiritual / Dharma angle
2. Practical / Social & Family angle

I’ll answer only from the Jain side, very simply.

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1. From Jain Dharma side

In Jainism:

• The highest goal is ātma‑kalyān (spiritual progress of the soul).
• Marriage is seen as a gṛihasth āshram (householder life) where both partners should support each other in dharma, ahimsā, satya, brahmacharya, aparigraha as much as possible.
• For this reason, traditionally, Jain shastras and Jain acharyas strongly prefer marriage within the same faith, because:

- Same beliefs → less conflict in daily practices (food, vrat, puja, festivals). - Easier to follow Jain ahimsā-based lifestyle (strict vegetarian, many avoid underground vegetables, alcohol, etc.). - Easier to raise children with clear Jain sanskārs.

So, from a pure Jain dharmic ideal, the preferred way is: