What strain should i grow ?

The humidity is a touch high but not that uncommon to many regions. As long as they're getting good airflow and not crammed in some type of little greenhouse they'll be fine. Be more mindful about overnight temp drops. If you're getting a lot of morning dew on your plants you want to shake them dry.

grow larfy ones to handel high RH.

They may list such things in their description, but i doubt the do the work to know whether the traits of the parents (assuming those are known in such great detail too) are transfered to the offspring. Even if both parents were disease-resistant, that doesn't mean the offspring will be. That'd take growing out hundreds of them and exposing them to see results while compared to a control group. So, this is often conjecture and assumption. With the warm temps and elevated RH, it's just gonna take some trial and error. Go by what they say, but don't deny reality if the so-called 'resistant' seeds you bought end up a dumpster fire of WPM. The seeds you buy are so interbred at this point the terms indica or sativa or what some of the parents lineage is as far as where it evovled is mostly jumbled up and unpredictable at this point. If you can track down lineage that is accurate, knowing which ones evolved around the equate are more likely to be adapted for such an environment. If it's been cross bred, that correlation gets weaker each generation further out. Leave temps are cooler than atmospheric temps, so your vpd at ~80F and 65% is around 1.2 (my table shows 79f and 65% as 1.25). This is fine for 99.999% of plants. It'll even be optimal for most of them when it matters most (flower), too. So, you really shouldn't have to worry too much. Maybe, avoid ruderalis since it originates in northern hemisphere... but as stated above, assuming those traits are in the interbred offspring is not gauranteed. there are definitely some autoflowers that will thrive around equator too.