The absolute $ value of the game's budget does not matter at all here because if the budget was higher, the ROI recovery would be only that much higher. And if the game isn't selling much on a platform outside of the subscription service, the only thing that matters is how much of the development cost (in percentage) is recovered from that deal.
For example, let's say Furi costs $100,000. With the PS+ deal, they recovered 33% of the dev cost, which means they now need to recover $67,000 (or 67%) from sales to break even.
On the other hand, let's say Haven costs $150,000 to develop. With the Gamepass deal, they recovered only 25% of the dev cost, which means they now need to recover 75% of the dev cost from sales to break even. Although they got more money from GP for Haven ($37,500) instead of what they got from Sony for the PS+ deal ($33,000), the PS+ deal was more financially feasible for them because it left them with less percentage of dev cost to recover to make a profit.