Always go for White Hat:
Top 5 White Hat SEO Techniques:
1. Quality Content
2. Use Structural (Semantic) Mark Up and Separate Content from Presentation
3. Titles and Meta Data
4. Keyword Research and Effective Keyword Use
5. Quality Inbound Links
White hat SEO Strategies are:
1. Appropriate tags length
2. Content quality
3. Back-link Quality
4. Indexing by XML to Google
5. local listing
Anything Black Hat will just hurt you in the long run and it will hurt your SEO efforts.