Pub tourneys v Casino tourneys

Im just looking for people's views on the different approaches you should have as regards playing a tourney in a pub rather than in a casino. There are some obvious differences in the structure, for example:
-Probably going to less players involved in a pub tourney
- Some/majority players in the pub tourney might not be that into poker and just playing for a night out
-Chip stacks tend to be significantly different i.e. the pub which i play in we start with 2300 in chips, blinds start off at 25/50 and increase every 20 minutes

From what i can tell tourneys in casinos start usually with 5000 or 10000....thus encouraging more actual poker instead of the crapshooting that tends to take place near the end of the pub tourney i play in.
The pub tourney i play in usually has about 21-25 players, with a final table of 8. Should a player play a different style at the beginning of a pub tourney as against a casino tourney???? Should the shorter stack in a pub tourney with a lot less skill being involved make you play a lot tighter????

Thanks for reading if you have, and any advice would be greatly appreciated....:)