RDDT vs. GOOGL: Which Ad-Tech Powerhouse Stock Has Greater Upside?

Reddit (RDDT) demonstrated exceptional Q2 2025 advertising revenue growth, surging 84% year-over-year to $465 million, driven by a 50% increase in active advertisers and enhanced engagement tools. In contrast, Alphabet (GOOGL) reported a 10.4% rise in Q2 2025 ad revenue to $71.34 billion, bolstered by Search and YouTube, though its Network ad business declined. While both benefit from a growing digital ad market, RDDT's rapid expansion and user engagement are cited as reasons for its greater upside potential, despite both stocks currently being considered overvalued based on forward Price/Sales multiples.

Analysis

The digital advertising market's projected 15.4% compound annual growth rate through 2030 provides a significant tailwind for both Reddit and Alphabet, though their recent performance highlights starkly different investment profiles. Reddit (RDDT) is in a hyper-growth phase, evidenced by an 84% year-over-year surge in Q2 advertising revenue to $465 million, driven by a 50% increase in its active advertiser count. This operational momentum is further supported by successful engagement initiatives like 'Reddit Answers,' which expanded its weekly user base from 1 million to 6 million. Consequently, RDDT's stock has rallied 42% year-to-date. In contrast, the mature industry leader Alphabet (GOOGL) reported more modest Q2 ad revenue growth of 10.4% to $71.34 billion. While its core Search (+11.7%) and YouTube (+13.1%) segments remain robust, its Google Network business contracted by 1.2%, signaling a point of weakness. Both companies are considered overvalued on a forward basis, but RDDT commands a much higher 17.35x forward price-to-sales multiple compared to GOOGL's 7.76x, reflecting the market's pricing of its superior growth prospects, which include a projected 154.35% earnings increase in 2025 versus 24.38% for GOOGL.

Key Decisions for Investors

• Investors must weigh Reddit's high-growth, high-multiple profile against Alphabet's stable, but slower-growing, market leadership, making the choice a classic growth versus value-at-scale decision.
• For those considering RDDT, it is critical to monitor the sustainability of its advertiser and user growth, as its premium 17.35x forward P/S valuation is highly sensitive to any deceleration in its current momentum.
• Investors holding GOOGL should closely watch the performance of its Google Network ad business, which declined 1.2%; a turnaround could signal renewed strength, while continued weakness may act as a drag on overall growth.
• Given that both stocks are flagged as overvalued, a prudent strategy involves carefully managing exposure to valuation risk, particularly in the case of RDDT, where market expectations are exceptionally high.