Naturally, what else would he choose but Quantum Clone for his base ability upgrade path and Quantum Replication for his new sub-ability.
Dante could list many reasons for his choices, but it simply came down to the fact that both of these choices ticked more boxes in his goals list than the others within the same category.
(A/N: Check chapter 163 for the goals list.)
The moment Dante made his choices, he felt a surge of knowledge and power encode itself into his very being, at a place deeper than his soul, spirit, body, or mind. It was as if superpowers were linked to one's very existence.
Just like his previous abilities, there wasn't much to it except instinctively knowing how to use these abilities. However, unlike any superpower in existence, the potency of Dante's Quantum Entanglement abilities - whether main or sub - were not based on his stats.