Is FormTitan a Wufoo alternative for Salesforce forms?

Yes - it is.
Wufoo is a very popular form builder suitable for beginners. It's a good tool but has its shortcomings like: it doesn't support responsive forms, does not have optimization features like A/B Testing, formatting your form fields is limited.

FormTitan, in comparison, is a robust platform for creating any type of online form. Its has many advantages that will allow you to:
- Create the form easily using Drag & Drop.
- Design aspects are limitless: pixel perfect, no strict layout, access to all elements styles.
- Responsive design.
- Easily customize your emails and messages. 
- Using built in optimization tools such as A/B Testing, Heatmaps, Auto translate etc to improve form conversion.
- Applying conditional logic to make the form "come alive".
- creating a PDF mapping.
- Adding payment integrations with 3rd parties.
- and more...

As for the Salesforce integration: Wufoo offers a one way integration with which you can write data in Salesforce. FormTitan, on the other hand, has a powerful 2 way integration, allowing you to both write to Salesforce and Read from Salesforce.