My wife played an urban gangrel, who was a street-hunter. Avoided the wilderness like the plague unless she had a reason to go into the wild. The urban/city gangrel is typically a bloodline of sabbat, but bloodline is bloodline, if your ST is willing to allow it, I find urban/city gangrel to be generally more effective than the default type of country gangrel, if only due to their mentality already allowing them to adopt to the streets instead of the aforementioned clan stereotype about running around in the wilderness. In the case of my wife's character, she was the team scout, avoiding combat if it could be helped, but could hold her own against most foes if need be (often preferring the stealth ambush, to get the drop on any trouble she could see coming, which couldn't be avoided by the cotorie otherwise).
As someone else already said, frenzy is not your friend, and this is a good point as frenzy leads to loss of humanity, and deformation of your character's appearance. However, frenzy "can" be utilized effectively if your character is in a sink or swim situation, especially If you are playing by 20th anniversary rules, the gangrel clan flaw is a little more forgiving (the animalistic traits you take, fade after a few (nights/weeks/months, ST's discretion, they ultimately aren't permanent). It is my understanding that a self induced frenzy (Purposely awakening one's own beast gives the vampire "some" measure of control over their activities by expenditure of willpower, which can make a difference when your surrounded, or need to overcome seemingly overwhelming odds. I point this out now because the "bezerker" status is typically reserved for brujah, however, a tactically intelligent gangrel can take it a step farther with the claws accessible by protean (which according to the description, are capable of slicing through solid steel), protean at later levels can allow for flight (bat form, owl form, raven form etc etc - You don't necessarily have to turn into a bat, though you should have a dedicated flight form), and the ability to phase though anything that has so much as a crack in it (mist form). Even still, while under a frenzy with protean active to any levels, still gives you the benefits of protean claws whenever you need to extend them, while allowing you to ignore wound penalties due to a frenzy. This can help under the situational circumstance that while in a frenzy (if it is self induced), the vampire will attack assailants before they turn on their cotorie.
As far as other disciplines go, obfuscate is your friend, anyway the coin lands, country or city. Being overlooked, or being thought of as nothing special can often be a benefit to your character, eavesdropping on conversations, moving around without drawing unwanted attention, or being able to deftly slip out of hot spots with the police hot on the trail of investigating the area of where a body was found. So long as you don't have anyone actively seeking your character out, your presence is overlooked. This "can" work on animals as well in some cases, vanish from the mind's eye is one of the best ways to emphasize stealth based characters. Of course, fortitude never hurts either if you know your going to frequently be faced with aggressive situations, so it comes to picking your poison (obfuscate can also be utilized to conceal frenzy deformations if need be).
Animalism vs celerity is a point of interest as well, for if your not going to be a country gangrel, you become less "hardy" and more "swift", you may lose fortitude to obfuscate, but in place of animalism, you would receive celerity. Animalism can always be bought later on as it still is prominent within the gangrel blood, it just wouldn't be a discipline you start with. The factor of blood expenditure associated with celeity also should be considered, how often your character feeds, how they approach situations, will they be making use of many animals around them? If not, then you may want to consider going city-gangrel. Otherwise, animalism has it's merits as well, sending nearby creatures into fits of rage (though this won't do much against other vampires, or anything with armor for that matter). Using animals as extensions of one's self to spy upon mortals during the day, or whatnot have you can be beneficial as well.