With older adults, I would 100% do I-134a v. the I-130 given considerations for health insurance. You will need to check the specifics for KY, but the I-134a affidavit is actually unenforceable, so they can conceivably get medicaid, food stamps, and any other program Cubans are eligible for immediately upon receiving parole. With an IR-5 visa, you instead sign a I-864 affidavit of support, which is enforceable, and you are on the hook for 10 years. Filing for AOS via the Cuban Adjustment Act is an additional expense, but if you factor in health insurance, it may actually save you a lot more going this route.