Originally Posted by konfetarius
Rockets are better from perspective of poking, but grenades allow you to survive ganks and help a lot more when you get a gank from your jungler. Plus, grenades absolutely wreck enemies like Xin or Shako in team fights and counter-ganks. The duration increase from leveling really, really helps.
Personally, I think Rylai should be the first AP item after your mana item (at least if you start off with Grenades over Rockets). The slow, even though it's the reduced AoE version, is still useful in team fights and chasing (it makes the first point in rockets a lot more valuable than it would have otherwise been). Heim's damage isn't that impressive when rushing massive AP. His utility and pushing, on the other hand, rule.
A smart Heimer is almost never ganked past level 6. Even if you're in mid lane and over extended all the way to the enemy turret, it will take 3 champs (meaning your opponent, their jungler, and one of the other lanes where there's no mia call) to gank you after you flash or ghost + upgrade. Add to that a bit of map awareness in the form of wards in both of the bushes and he can overextend all day long and take shots at the enemy turret relatively unharmed.)
Rockets vs Grenades
- Stun/Blind Effect
- Can hit more than 3 targets if they are close together
- Stronger harass, can't be dodged without playing super defensively (Hiding far behind minions
- Better for last hitting 3 minions at once during laning (When you're ready to push the lane to the turret and start taking chunks of it down)
- Better for chasing down a fleeing enemy (Once an enemy is a certain distance away, you won't land a grenade no matter how good your aim is. Rockets will hit even if they walk out of range after you fire it)
If you have any other pros for the Grenade you should add them in. If you're getting ganked as Heimer though, you are doing something wrong. His huge health regen, Ghost/Flash, high early game burst, and consistent damage/slow from upgraded turrets make him near impossible to gank. Plus, he's an amazing farmer. Spend some money and wards.
If anything, it would be okay to take one level of the Grenade early on just so you can stun (which doesn't change with level).
Oh, as a side note, Rylai's effect counts as "single target" for rockets, so they do the full 35% slow.
The reason you are getting "hunted" is because you aren't getting turrets. Two turrets placed on either side of the mid lane just beyond where the creeps meet naturally are enough to deter any 2 man gank attempt just by popping upgrade. In fact, once I've got my Chalice and boots 1, I push the lane hard every time there is a cannon minion coming, then follow my wave in to the tower and plop a turret right next to it. A quick shot with the rockets to scare the enemy mid away and I walk off scratch free. After a few rounds of that, the middle tower is gone. I wish I had played Heimer back when he had more turrets and they were stronger, but even as they are now, they're more than enough to keep you safe even if you're super aggressive.
That being said, I agree with Ghost/Flash as Summoner Skills, just because as I just described, I play super aggressively.