A Fusion Summon, or the Summoning of any Monster (Synchro or Fusion) from the Fusion Deck (Extra Deck) is a special summon and so Trap Hole will not work on it.
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It depends on the circumstances. Generally, "Bottomless Trap Hole" will be the better card; it works on Special Summons and it removes the monster it destroys from play. However, "Trap Hole" has one advantage: the monster summoned only needs 1000 ATK to trigger it, whereas "Bottomless Trap Hole" requires at least 1500 ATK. So, it would depend upon the type of deck you planned to use or went up against, but most people would choose "Bottomless Trap Hole".
no.
Bottomless Trap Hole does not target, so Tyrant Dragon is unable to negate it.
Normal summon, no. Special summon, yes.The reason is, when Obelisk is normal summoned, no spells, traps or monster effects can be activated. That means it prevents anything being activated in the 'summon response' window, which is where you'd normally use cards like Trap Hole, Bottomless Trap Hole, Torrential Tribute, etc.
"Botttomless Trap Hole" is typically viewed as being better than "Trap Hole" since the destroyed monster in banished/removed from play. A majority of cards function off of cards in the Graveyard or even activate in the Graveyard, so banishing the monster would be more disruptive. That being said, "Trap Hole" can destroy monsters with an ATK under 1500 unlike its "Bottomless" counterpart. Plus there are a few monsters like "D.D. Survivor" that function better when removed from play.