Assume you are the CFO of a mid-sized tech company. The company is planning a significant expansion and needs to raise $500 million. Market conditions are currently favorable for tech investments, but interest rates are on the rise. The company's goal is to sustain rapid growth over the next three years, with an eventual IPO in mind. Evaluate and recommend whether the company should primarily raise this capital through debt or equity. What are the key factors you would consider, and walk me through your decision-making logic.

假设你是一家中型科技公司的CFO，公司正计划进行一笔重大扩张，需要募集5亿元资金。目前，市场对科技行业投资热情高涨，但利率也处于上升通道。公司希望在未来三年内保持快速增长，并最终考虑IPO。请你分析并给出建议，公司应主要通过发行债务还是股权来募集这笔资金？你需要考虑哪些关键因素，并说明你的决策逻辑。