On price, 20i starts lower at $2.49/mo against $2.95/mo for Bluehost. 20i carries the higher rating overall, at 4.6/5, and 20i reports the better tracked uptime at 99.99%. Bluehost has been operating longer, since 1996.
If entry price is what decides it, start with 20i. If rating and reliability matter more than the sticker price, 20i has the edge. Either way, read the full profile before you buy — the trade-offs section on each page covers what the summary numbers leave out.