19 video tutorials for WPForms cover:

What is WPForms?
The WPForms Form Builder
The General Field Options Tab
The Advanced Options Tab
What is Conditional Logic?
Setting Up Email Notifications
Add a WPForm to a Page
Manage Form Entries
Protect Against Form Spam
Create Multi-Page Forms
Create a File Upload Form
Create Surveys and Polls
Create Interactive Forms
Create Online Payment Forms
Connect WPForms to Mailchimp
Create Advanced Forms
Create a Form Landing Page
Increase Form Conversions
Fix Email Deliverability Problems

18 video tutorials for Ninja Forms form builder cover:

Introduction to Ninja Forms
How to Install Ninja Forms
Getting to Know the Builder
Restrictions and Other Advanced Options
How to Send an Email
Advanced Form Settings
Adding a Form to a Page
Managing Form Submissions
Layout & Styles
Multi-Part Forms
Conditional Logic
Calculations
How to Create a Quote Request Form
How to Add a File Upload Field to your Form
How to Use Zapier with Ninja Forms
Collect Payments with PayPal and Ninja Forms
Collect Payments with Stripe and Ninja Forms
Create a MailChimp Email Signup Form