Log Data Comparison Report

I have several .txt / .log files that need to be examined side-by-side. The goal is twofold: first, highlight any additions, deletions or other differences between the files, and second, extract useful statistics and trend lines so I can see key indicators at a glance... (Budget: $30 - $250 USD, Jobs: Data Analysis, Data Processing, Data Visualization, Python, R Programming Language, Report Writing, Statistical Analysis, Statistics)